Materiały źródłowe

• #1 Penicillin Allergy – STI Treatment Guidelines

  https://www.cdc.gov/std/treatment-guidelines/penicillin-allergy.htm

  Penicillin allergy is often overreported, with the majority of patients who report penicillin allergy able to tolerate the medication. […] The overreported prevalence of penicillin allergy is secondary to imprecise use of the term allergy by families and clinicians and lack of clarity to differentiate between immunoglobulin E (IgE)-mediated hypersensitivity reactions, drug intolerances, and other idiosyncratic reactions that can occur days after exposure. […] Approximately 80% of patients with a true IgE-mediated allergic reaction to penicillin have lost the sensitivity after 10 years. […] In a Baltimore, Maryland, STI clinic study, only 7.1% of the patients who reported allergy to penicillin or to another -lactam antibiotic had an objective positive test for penicillin allergy. […] Moreover, in studies that have incorporated penicillin skin testing and graded oral challenge among persons with reported penicillin allergy, the true rates of allergy are low, ranging from 1.5% to 6.1%.

• #2 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Approximately 10% of people in the United States report they are allergic to penicillin antibiotics. However, a research study tested people who thought they had an allergy to penicillin. Of those tested, 9 of 10 people did not have any allergic reaction, meaning they can safely take these very helpful antibiotics. Even better news: many people with true penicillin allergies, even those with serious reactions like anaphylaxis, will outgrow their allergy over time 50% by 5 years and 80% by 10 years after their initial allergic reaction. […] Some symptoms below, such as hives or diarrhea, can be simple side effects of antibiotics, but when any symptoms below begin within minutes to hours after the first dose of an antibiotic, it may be a sign of an allergic reaction (true penicillin allergy).

• #3 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Approximately 10% of people in the United States report they are allergic to penicillin antibiotics. However, a research study tested people who thought they had an allergy to penicillin. Of those tested, 9 of 10 people did not have any allergic reaction, meaning they can safely take these very helpful antibiotics. Even better news: many people with true penicillin allergies, even those with serious reactions like anaphylaxis, will outgrow their allergy over time 50% by 5 years and 80% by 10 years after their initial allergic reaction. […] Some symptoms below, such as hives or diarrhea, can be simple side effects of antibiotics, but when any symptoms below begin within minutes to hours after the first dose of an antibiotic, it may be a sign of an allergic reaction (true penicillin allergy).

• #4 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  10% of U.S. patients report having a penicillin allergy, but less than 1% of the population is truly allergic. […] Approximately 80% of patients with IgE-mediated penicillin allergy lose their sensitivity after 10 years. […] Reactions that occur immediately or usually within one hour. […] Hives: Multiple pink or red raised areas of skin that are intensely itchy. […] Angioedema: Localized edema without hives affecting the abdomen, face, extremities, genitalia, oropharynx or larynx. […] Wheezing and shortness of breath. […] Anaphylaxis. […] Anaphylaxis (severe allergic reaction) must have signs or symptoms in at least two of the following systems: Skin: Hives, flushing, itching, and/or angioedema. […] Respiratory: Cough, nasal congestion, shortness of breath, chest tightness, wheeze, sensation of throat closure or choking, and/or change in voice-quality (laryngeal edema).

• #5 Penicillin Allergy > Fact Sheets > Yale Medicine

  https://www.yalemedicine.org/conditions/penicillin-allergy

  Symptoms include hives and swelling on the skin, throat tightness, and difficulty breathing […] Allergic reactions to penicillins can be acute or delayed. Acute symptoms can occur quickly, usually within an hour of taking the medicine. These allergic reactions can include: Skin reactions such as itching, rash and/or hives, and swelling […] Tightness in the throat […] Respiratory symptoms such as wheezing, coughing and difficulty breathing […] In some cases, an allergy to penicillin can result in anaphylaxis. This is a life-threatening condition that may be marked by dizziness or lightheadedness, difficulty breathing, swelling of the tongue or throat, seizures, very low blood pressure, vomiting, diarrhea and abdominal cramps […] Delayed reactions to penicillins, which commonly include rash or itch, typically appear after days or weeks of administration of the drug.

• #6 Penicillin Allergy > Fact Sheets > Yale Medicine

  https://www.yalemedicine.org/conditions/penicillin-allergy

  Symptoms include hives and swelling on the skin, throat tightness, and difficulty breathing […] Allergic reactions to penicillins can be acute or delayed. Acute symptoms can occur quickly, usually within an hour of taking the medicine. These allergic reactions can include: Skin reactions such as itching, rash and/or hives, and swelling […] Tightness in the throat […] Respiratory symptoms such as wheezing, coughing and difficulty breathing […] In some cases, an allergy to penicillin can result in anaphylaxis. This is a life-threatening condition that may be marked by dizziness or lightheadedness, difficulty breathing, swelling of the tongue or throat, seizures, very low blood pressure, vomiting, diarrhea and abdominal cramps […] Delayed reactions to penicillins, which commonly include rash or itch, typically appear after days or weeks of administration of the drug.

• #7 Penicillin Allergy: Causes & Symptoms

  https://my.clevelandclinic.org/health/diseases/16624-penicillin-allergies

  A penicillin allergy is a common allergy. It occurs when your immune system reacts negatively to the antibiotic penicillin. You may experience a skin rash, swelling or difficulty breathing shortly after taking penicillin. An allergic reaction can be a medical emergency, so contact your healthcare provider or call 911 if symptoms are severe. […] The most common symptoms of a penicillin allergy include: Skin rash or hives (a raised pink areas of skin). Itchy skin. Coughing. Nasal congestion. Swelling around your face, hands and feet. […] You’ll most likely experience these symptoms within an hour after taking penicillin. In rare cases among adults, these symptoms can show up days to weeks after you’ve taken penicillin. […] The most dangerous reaction to penicillin is anaphylaxis, which is a severe, life-threatening allergic reaction. If you have any of the following symptoms, call 911, your local emergency services or visit the emergency room (ER): Swelling throughout your body. Wheezing or difficulty breathing (dyspnea). Dangerously low blood pressure. Tightness in your chest. Diarrhea. Nausea and vomiting. Feeling dizzy or light-headed. Fast or irregular heartbeat. Fainting or loss of consciousness (syncope).

• #8 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Penicillin is also one of the most frequently reported medication allergies. […] Identification of true penicillin allergy is critical as 80% to 90% of people once considered allergic are ultimately able to tolerate penicillins resulting in the decreased need for broad-spectrum antibiotics and development of multi-drug resistant organisms. […] Serious allergic reactions to penicillin are Type 1 and mediated by IgE. […] The incidence of anaphylaxis to penicillin is 0.02% to 0.04% and is mediated by a type 1 hypersensitivity reaction. Overall, cutaneous eruptions are the most commonly reported reaction. […] Immediate reactions are the result of IgE that cross-like on mast cells when exposed to the antigenic component. The result is degranulation and release of histamine as well as other vasoactive substances. It is the minor antigenic determinates that generate IgE specific responses that are associated with true penicillin allergy. These minor determinates result in immediate reactions, within minutes to 1 hour, and characterized by signs and symptoms of acute anaphylaxis such as urticaria, flushing, dyspnea, bronchospasm with wheezing, angioedema, hypotension, tachycardia, mental status change or gastrointestinal (GI) upset.

• #9 Penicillin Allergy: Causes & Symptoms

  https://my.clevelandclinic.org/health/diseases/16624-penicillin-allergies

  A penicillin allergy is a common allergy. It occurs when your immune system reacts negatively to the antibiotic penicillin. You may experience a skin rash, swelling or difficulty breathing shortly after taking penicillin. An allergic reaction can be a medical emergency, so contact your healthcare provider or call 911 if symptoms are severe. […] The most common symptoms of a penicillin allergy include: Skin rash or hives (a raised pink areas of skin). Itchy skin. Coughing. Nasal congestion. Swelling around your face, hands and feet. […] You’ll most likely experience these symptoms within an hour after taking penicillin. In rare cases among adults, these symptoms can show up days to weeks after you’ve taken penicillin. […] The most dangerous reaction to penicillin is anaphylaxis, which is a severe, life-threatening allergic reaction. If you have any of the following symptoms, call 911, your local emergency services or visit the emergency room (ER): Swelling throughout your body. Wheezing or difficulty breathing (dyspnea). Dangerously low blood pressure. Tightness in your chest. Diarrhea. Nausea and vomiting. Feeling dizzy or light-headed. Fast or irregular heartbeat. Fainting or loss of consciousness (syncope).

• #10 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Common signs and symptoms of penicillin allergy include hives, rash and itching. Severe reactions include anaphylaxis, a life-threatening condition that affects multiple body systems. […] Signs and symptoms of penicillin allergy often occur within an hour after taking the drug. Less commonly, reactions can occur hours, days or weeks later. […] Penicillin allergy signs and symptoms may include: Skin rash, Hives, Itching, Fever, Swelling, Shortness of breath, Wheezing, Runny nose, Itchy, watery eyes, Anaphylaxis. […] Anaphylaxis is a rare, life-threatening allergic reaction that causes the widespread dysfunction of body systems. Signs and symptoms of anaphylaxis include: Tightening of the airways and throat, causing trouble breathing, Nausea or abdominal cramps, Vomiting or diarrhea, Dizziness or lightheadedness, Weak, rapid pulse, Drop in blood pressure, Seizures, Loss of consciousness.

• #11 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Itchy skin, flushing, hives […] Swelling of hands feet or skin around the eyes (angioedema) […] Itching, tearing red eyes […] Nasal congestion […] Tongue and/or lip swelling […] Throat tightness, hoarseness […] Stomach cramps, sudden diarrhea […] Cough, difficulty breathing/wheezing […] Dizziness, fainting, low blood pressure […] Anxiety, confusion.

• #12 Penicillin allergy: Definition, treatment, and more

  https://www.medicalnewstoday.com/articles/penicillin-allergy

  A penicillin allergy can cause symptoms such as hives, shortness of breath, and areas of swelling. In some cases, it may also lead to anaphylaxis, a life threatening condition that causes low blood pressures, a fast heartbeat, and faintness. […] A penicillin allergy can stimulate the production of different types of immunoglobulins. If it triggers immunoglobulin E (IgE), the symptoms can appear immediately or within an hour. […] These symptoms may include: hives, which are multiple inflamed, itchy, raised areas of skin; angioedema, which refers to localized areas of swelling without hives that affect the face, abdomen, genitals, voice box, throat, arms, or legs; shortness of breath and wheezing; anaphylaxis. […] Anaphylaxis is a life threatening condition that can occur immediately or within an hour of taking penicillin. Symptoms can affect two or more of the following organ systems: Skin: Effects may involve hives, angioedema, flushing, or itching; Respiratory system: Effects may include coughing, shortness of breath, wheezing, chest tightness, nasal congestion, the sensation of choking, or throat closure; Gastrointestinal system: Effects may include nausea, vomiting, diarrhea, or abdominal pain; Cardiovascular system: Effects may involve a rapid heartbeat, low blood pressure, or feeling faint.

• #13 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Delayed reactions are mediated by IgM and IgG which activates the complement system resulting in inflammatory reactions that include Type 2 to 4 hypersensitivity reactions. Serious hypersensitivity reactions include hemolytic anemia, toxic epidermal necrolysis (TEN), Steven’s Johnson Syndrome (SJS), vasculitis, interstitial nephritis, serum sickness, thrombocytopenia, and neutropenia. […] Common cutaneous symptoms are generalized urticaria, flushing, pruritis, and angioedema.

• #14 Penicillin Allergy > Fact Sheets > Yale Medicine

  https://www.yalemedicine.org/conditions/penicillin-allergy

  Symptoms include hives and swelling on the skin, throat tightness, and difficulty breathing […] Allergic reactions to penicillins can be acute or delayed. Acute symptoms can occur quickly, usually within an hour of taking the medicine. These allergic reactions can include: Skin reactions such as itching, rash and/or hives, and swelling […] Tightness in the throat […] Respiratory symptoms such as wheezing, coughing and difficulty breathing […] In some cases, an allergy to penicillin can result in anaphylaxis. This is a life-threatening condition that may be marked by dizziness or lightheadedness, difficulty breathing, swelling of the tongue or throat, seizures, very low blood pressure, vomiting, diarrhea and abdominal cramps […] Delayed reactions to penicillins, which commonly include rash or itch, typically appear after days or weeks of administration of the drug.

• #15 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Common signs and symptoms of penicillin allergy include hives, rash and itching. Severe reactions include anaphylaxis, a life-threatening condition that affects multiple body systems. […] Signs and symptoms of penicillin allergy often occur within an hour after taking the drug. Less commonly, reactions can occur hours, days or weeks later. […] Penicillin allergy signs and symptoms may include: Skin rash, Hives, Itching, Fever, Swelling, Shortness of breath, Wheezing, Runny nose, Itchy, watery eyes, Anaphylaxis. […] Anaphylaxis is a rare, life-threatening allergic reaction that causes the widespread dysfunction of body systems. Signs and symptoms of anaphylaxis include: Tightening of the airways and throat, causing trouble breathing, Nausea or abdominal cramps, Vomiting or diarrhea, Dizziness or lightheadedness, Weak, rapid pulse, Drop in blood pressure, Seizures, Loss of consciousness.

• #16 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Itchy skin, flushing, hives […] Swelling of hands feet or skin around the eyes (angioedema) […] Itching, tearing red eyes […] Nasal congestion […] Tongue and/or lip swelling […] Throat tightness, hoarseness […] Stomach cramps, sudden diarrhea […] Cough, difficulty breathing/wheezing […] Dizziness, fainting, low blood pressure […] Anxiety, confusion.

• #17 Penicillin Allergy > Fact Sheets > Yale Medicine

  https://www.yalemedicine.org/conditions/penicillin-allergy

  Symptoms include hives and swelling on the skin, throat tightness, and difficulty breathing […] Allergic reactions to penicillins can be acute or delayed. Acute symptoms can occur quickly, usually within an hour of taking the medicine. These allergic reactions can include: Skin reactions such as itching, rash and/or hives, and swelling […] Tightness in the throat […] Respiratory symptoms such as wheezing, coughing and difficulty breathing […] In some cases, an allergy to penicillin can result in anaphylaxis. This is a life-threatening condition that may be marked by dizziness or lightheadedness, difficulty breathing, swelling of the tongue or throat, seizures, very low blood pressure, vomiting, diarrhea and abdominal cramps […] Delayed reactions to penicillins, which commonly include rash or itch, typically appear after days or weeks of administration of the drug.

• #18 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Itchy skin, flushing, hives […] Swelling of hands feet or skin around the eyes (angioedema) […] Itching, tearing red eyes […] Nasal congestion […] Tongue and/or lip swelling […] Throat tightness, hoarseness […] Stomach cramps, sudden diarrhea […] Cough, difficulty breathing/wheezing […] Dizziness, fainting, low blood pressure […] Anxiety, confusion.

• #19 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Itchy skin, flushing, hives […] Swelling of hands feet or skin around the eyes (angioedema) […] Itching, tearing red eyes […] Nasal congestion […] Tongue and/or lip swelling […] Throat tightness, hoarseness […] Stomach cramps, sudden diarrhea […] Cough, difficulty breathing/wheezing […] Dizziness, fainting, low blood pressure […] Anxiety, confusion.

• #20 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Penicillin is also one of the most frequently reported medication allergies. […] Identification of true penicillin allergy is critical as 80% to 90% of people once considered allergic are ultimately able to tolerate penicillins resulting in the decreased need for broad-spectrum antibiotics and development of multi-drug resistant organisms. […] Serious allergic reactions to penicillin are Type 1 and mediated by IgE. […] The incidence of anaphylaxis to penicillin is 0.02% to 0.04% and is mediated by a type 1 hypersensitivity reaction. Overall, cutaneous eruptions are the most commonly reported reaction. […] Immediate reactions are the result of IgE that cross-like on mast cells when exposed to the antigenic component. The result is degranulation and release of histamine as well as other vasoactive substances. It is the minor antigenic determinates that generate IgE specific responses that are associated with true penicillin allergy. These minor determinates result in immediate reactions, within minutes to 1 hour, and characterized by signs and symptoms of acute anaphylaxis such as urticaria, flushing, dyspnea, bronchospasm with wheezing, angioedema, hypotension, tachycardia, mental status change or gastrointestinal (GI) upset.

• #21 Patient education: Allergy to penicillin and related antibiotics (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/allergy-to-penicillin-and-related-antibiotics-beyond-the-basics/print

  […] […] A past history of these types of reactions is important because the person might develop a more severe reaction, such as anaphylaxis, if they were to take the antibiotic again. Mild-to-moderate allergic reactions to penicillins occur in 1 to 5 percent of people taking the medication. […] […] […] Anaphylaxis — Anaphylaxis is a sudden, potentially life-threatening allergic reaction. Symptoms include those of an allergic reaction, such as hives and swelling, as well as very low blood pressure, difficulty breathing, abdominal pain, swelling of the throat or tongue, and/or diarrhea or vomiting. Fortunately, anaphylaxis is uncommon. Anaphylaxis is uncommon in patients taking penicillin and other beta-lactam antibiotics and occurs in 1/200,000 people being treated with oral penicillins and 1/10,000 being treated with intravenous or intramuscular penicillins.

• #22 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  10% of U.S. patients report having a penicillin allergy, but less than 1% of the population is truly allergic. […] Approximately 80% of patients with IgE-mediated penicillin allergy lose their sensitivity after 10 years. […] Reactions that occur immediately or usually within one hour. […] Hives: Multiple pink or red raised areas of skin that are intensely itchy. […] Angioedema: Localized edema without hives affecting the abdomen, face, extremities, genitalia, oropharynx or larynx. […] Wheezing and shortness of breath. […] Anaphylaxis. […] Anaphylaxis (severe allergic reaction) must have signs or symptoms in at least two of the following systems: Skin: Hives, flushing, itching, and/or angioedema. […] Respiratory: Cough, nasal congestion, shortness of breath, chest tightness, wheeze, sensation of throat closure or choking, and/or change in voice-quality (laryngeal edema).

• #23 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  10% of U.S. patients report having a penicillin allergy, but less than 1% of the population is truly allergic. […] Approximately 80% of patients with IgE-mediated penicillin allergy lose their sensitivity after 10 years. […] Reactions that occur immediately or usually within one hour. […] Hives: Multiple pink or red raised areas of skin that are intensely itchy. […] Angioedema: Localized edema without hives affecting the abdomen, face, extremities, genitalia, oropharynx or larynx. […] Wheezing and shortness of breath. […] Anaphylaxis. […] Anaphylaxis (severe allergic reaction) must have signs or symptoms in at least two of the following systems: Skin: Hives, flushing, itching, and/or angioedema. […] Respiratory: Cough, nasal congestion, shortness of breath, chest tightness, wheeze, sensation of throat closure or choking, and/or change in voice-quality (laryngeal edema).

• #24 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  Cardiovascular: Hypotension, faintness, tachycardia or less commonly bradycardia, tunnel vision, chest pain, sense of impending doom and/or loss of consciousness. […] Gastrointestinal: Nausea, vomiting, abdominal cramping, and diarrhea. […] A positive result means the patient is likely to have a penicillin allergy. If negative, a skin test is usually followed by an oral penicillin class challenge (like amoxicillin) to safely rule out an IgE-mediated penicillin allergy. […] The skin test and challenge described here are not appropriate for patients with these severe hypersensitivity syndromes. […] Many cephalosporins, especially in the later generations, can be safely tolerated despite a penicillin allergy. […] Children who receive amoxicillin or ampicillin and have Epstein-Barr virus infection can develop a non-allergic, non-pruritic rash, that can appear similar to an allergic reaction.

• #25 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  Cardiovascular: Hypotension, faintness, tachycardia or less commonly bradycardia, tunnel vision, chest pain, sense of impending doom and/or loss of consciousness. […] Gastrointestinal: Nausea, vomiting, abdominal cramping, and diarrhea. […] A positive result means the patient is likely to have a penicillin allergy. If negative, a skin test is usually followed by an oral penicillin class challenge (like amoxicillin) to safely rule out an IgE-mediated penicillin allergy. […] The skin test and challenge described here are not appropriate for patients with these severe hypersensitivity syndromes. […] Many cephalosporins, especially in the later generations, can be safely tolerated despite a penicillin allergy. […] Children who receive amoxicillin or ampicillin and have Epstein-Barr virus infection can develop a non-allergic, non-pruritic rash, that can appear similar to an allergic reaction.

• #26 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  Cardiovascular: Hypotension, faintness, tachycardia or less commonly bradycardia, tunnel vision, chest pain, sense of impending doom and/or loss of consciousness. […] Gastrointestinal: Nausea, vomiting, abdominal cramping, and diarrhea. […] A positive result means the patient is likely to have a penicillin allergy. If negative, a skin test is usually followed by an oral penicillin class challenge (like amoxicillin) to safely rule out an IgE-mediated penicillin allergy. […] The skin test and challenge described here are not appropriate for patients with these severe hypersensitivity syndromes. […] Many cephalosporins, especially in the later generations, can be safely tolerated despite a penicillin allergy. […] Children who receive amoxicillin or ampicillin and have Epstein-Barr virus infection can develop a non-allergic, non-pruritic rash, that can appear similar to an allergic reaction.

• #27 Penicillin allergy – Diagnosis & treatment – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/penicillin-allergy/diagnosis-treatment/drc-20376226

  A positive reaction to a test will cause a red, itchy, raised bump. […] A positive result indicates a high likelihood of penicillin allergy. […] The following interventions may be used to treat the symptoms of an allergic reaction to penicillin: […] If your doctor determines that you have a penicillin allergy or likely allergy discontinuing the drug is the first step in treatment. […] Anaphylaxis requires an immediate epinephrine injection as well as hospital care to maintain blood pressure and support breathing. […] Desensitization is not always successful, and there is a risk of serious reactions.

• #28 THE FACTS ABOUT PENICILLIN ALLERGY: A REVIEW

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3255391/

  Anaphylaxis, characterized by symptomatic hypotension with associated dyspnoea, urticaria, and possibly gastrointestinal (GI) symptoms, is the most severe manifestation of IgE-mediated drug allergy. It is most common after parenteral drug administration and is rare with oral or cutaneous exposure. Anaphylaxis results when antigen-specific IgE is present on mast cells and a systemic exposure to antigen occurs, cross-linking the IgE. This results in the simultaneous degranulation of large numbers of mast cells. […] A mild allergic reaction can be treated with an antihistaminics like diphenhydramine, which helps relieve itching and skin rash. However, serious anaphylactic reactions require the urgent administration of adrenalin to counter the cardiac collapse as well as corticosteroids to counteract the effect of the mediators released from the mast cell. In the case of a true anaphylactic hypersensitivity reaction, a patient may die unless controlled with adrenaline and their airway is maintained.

• #29 Penicillin Allergy > Fact Sheets > Yale Medicine

  https://www.yalemedicine.org/conditions/penicillin-allergy

  Symptoms include hives and swelling on the skin, throat tightness, and difficulty breathing […] Allergic reactions to penicillins can be acute or delayed. Acute symptoms can occur quickly, usually within an hour of taking the medicine. These allergic reactions can include: Skin reactions such as itching, rash and/or hives, and swelling […] Tightness in the throat […] Respiratory symptoms such as wheezing, coughing and difficulty breathing […] In some cases, an allergy to penicillin can result in anaphylaxis. This is a life-threatening condition that may be marked by dizziness or lightheadedness, difficulty breathing, swelling of the tongue or throat, seizures, very low blood pressure, vomiting, diarrhea and abdominal cramps […] Delayed reactions to penicillins, which commonly include rash or itch, typically appear after days or weeks of administration of the drug.

• #30 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Common signs and symptoms of penicillin allergy include hives, rash and itching. Severe reactions include anaphylaxis, a life-threatening condition that affects multiple body systems. […] Signs and symptoms of penicillin allergy often occur within an hour after taking the drug. Less commonly, reactions can occur hours, days or weeks later. […] Penicillin allergy signs and symptoms may include: Skin rash, Hives, Itching, Fever, Swelling, Shortness of breath, Wheezing, Runny nose, Itchy, watery eyes, Anaphylaxis. […] Anaphylaxis is a rare, life-threatening allergic reaction that causes the widespread dysfunction of body systems. Signs and symptoms of anaphylaxis include: Tightening of the airways and throat, causing trouble breathing, Nausea or abdominal cramps, Vomiting or diarrhea, Dizziness or lightheadedness, Weak, rapid pulse, Drop in blood pressure, Seizures, Loss of consciousness.

• #31 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Delayed reactions are mediated by IgM and IgG which activates the complement system resulting in inflammatory reactions that include Type 2 to 4 hypersensitivity reactions. Serious hypersensitivity reactions include hemolytic anemia, toxic epidermal necrolysis (TEN), Steven’s Johnson Syndrome (SJS), vasculitis, interstitial nephritis, serum sickness, thrombocytopenia, and neutropenia. […] Common cutaneous symptoms are generalized urticaria, flushing, pruritis, and angioedema.

• #32 Penicillin allergy: Delayed hypersensitivity reactions – UpToDate

  https://www.uptodate.com/contents/penicillin-allergy-delayed-hypersensitivity-reactions

  Penicillin allergy in all of its forms is self-reported by about 5 to 10 percent of patients. […] Many of these patients have delayed forms of hypersensitivity, which typically begin more than six hours after the last administered dose and often after days of treatment. […] Delayed (nonimmediate) reactions usually appear after more than one dose of drug and typically after days of treatment. For example, delayed cutaneous maculopapular eruptions to amoxicillin classically start on day 7 to 10 of treatment and may even begin 1 to 3 days after cessation of treatment. The symptoms typically begin several hours after the last administered dose, although the timing relative to the last administered dose is variable. However, symptoms should not begin within one hour of the initial dose of a medication.

• #33 Patient education: Allergy to penicillin and related antibiotics (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/allergy-to-penicillin-and-related-antibiotics-beyond-the-basics/print

  […] […] Rashes — Several different types of rashes can appear while people are taking a penicillin medication: […] • Rashes that involve hives (raised, intensely itchy spots that come and go over hours) or occur with other allergic symptoms like wheezing or swelling of the skin or throat suggest a true allergy (picture 1). […] • Rashes that are flat, blotchy, and spread over days but do not change by the hour are less likely to represent a dangerous allergy (picture 2). These rashes typically start after several days of treatment. […] […] […] Allergic reactions — An allergic reaction occurs when the immune system begins to recognize a drug as something „foreign.” Several different symptoms can indicate that a person is allergic to penicillin. These include hives (raised, intensely itchy spots that come and go over hours) (picture 1), angioedema (swelling of the tissue under the skin, commonly around the face), throat tightness, wheezing, coughing, and trouble breathing from asthma-like reactions (narrowing of the airways into the lungs).

• #34 Penicillin allergy

  https://eastkentformulary.nhs.uk/therapeutic-sections/5-infection/antimicrobial-guide-primary-care/supporting-information-antimicrobials/penicillin-allergy/

  Patients who are truely allergic to one penicillin will be allergic to all because the hypersensitivity is related to the basic penicillin structure. […] More commonly penicillin hypersensitivity manifests as a rash, the typical presentation being a maculopapular, erythematous rash symmetrically disposed over the legs, buttocks and trunk. […] Patients with a definite history of non-urticarial rash allergy to penicillin should not receive a penicillin but the likelihood of serious cross-sensitivity with cephalosporins or carbapenems is very low so other non-penicillin beta lactam antibiotics can be used in these patients. […] Very rarely penicillins can cause pemphigus vulgaris or pemphigoid-like reactions. […] Patients often describe side effects such as diarrhoea or nausea as allergies, so careful history taking is extremely important to distinguish between true allergy and manageable side effects.

• #35 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Less-common penicillin allergy reactions occur days or weeks after exposure to the drug and may persist for some time after you stop taking it. These conditions include: Serum sickness, which may cause fever, joint pain, rash, swelling and nausea, Drug-induced anemia, a reduction in red blood cells, which can cause fatigue, irregular heartbeats, shortness of breath, and other signs and symptoms, Drug reaction with eosinophilia and systemic symptoms (DRESS), which results in rash, high white blood cell counts, general swelling, swollen lymph nodes and recurrence of dormant hepatitis infection, Stevens-Johnson syndrome or toxic epidermal necrolysis, which involves severe blistering and peeling of the skin, Inflammation in the kidneys (nephritis), which can cause fever, blood in the urine, general swelling, confusion, and other signs and symptoms.

• #36 Understanding Penicillin Allergy: Symptoms And Risks

  https://www.coastalallergyasthma.com/allergy-overview/allergy-types/drug-allergy/penicillin-allergy/

  Other symptoms that may occur after days or weeks include, achy joints, swelling, rash, nausea, drowsiness, fever, blood in the urine, irregular heartbeat and confusion. […] An allergic reaction to penicillin typically occurs in 10% of patients, and can only happen on the second exposure to penicillin. Symptoms may include: rash, hives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and watery eyes, or anaphylaxis. In rare cases are the symptoms life-threatening. You may be at high risk for an allergic reaction if you have other food or drug allergies, or have a family history of a penicillin allergy.

• #37 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Less-common penicillin allergy reactions occur days or weeks after exposure to the drug and may persist for some time after you stop taking it. These conditions include: Serum sickness, which may cause fever, joint pain, rash, swelling and nausea, Drug-induced anemia, a reduction in red blood cells, which can cause fatigue, irregular heartbeats, shortness of breath, and other signs and symptoms, Drug reaction with eosinophilia and systemic symptoms (DRESS), which results in rash, high white blood cell counts, general swelling, swollen lymph nodes and recurrence of dormant hepatitis infection, Stevens-Johnson syndrome or toxic epidermal necrolysis, which involves severe blistering and peeling of the skin, Inflammation in the kidneys (nephritis), which can cause fever, blood in the urine, general swelling, confusion, and other signs and symptoms.

• #38 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Less-common penicillin allergy reactions occur days or weeks after exposure to the drug and may persist for some time after you stop taking it. These conditions include: Serum sickness, which may cause fever, joint pain, rash, swelling and nausea, Drug-induced anemia, a reduction in red blood cells, which can cause fatigue, irregular heartbeats, shortness of breath, and other signs and symptoms, Drug reaction with eosinophilia and systemic symptoms (DRESS), which results in rash, high white blood cell counts, general swelling, swollen lymph nodes and recurrence of dormant hepatitis infection, Stevens-Johnson syndrome or toxic epidermal necrolysis, which involves severe blistering and peeling of the skin, Inflammation in the kidneys (nephritis), which can cause fever, blood in the urine, general swelling, confusion, and other signs and symptoms.

• #39

  https://bpac.org.nz/bpj/2015/june/allergy.aspx

  Allergy is an immunological reaction (IgE-mediated hypersensitivity) to a medicine. It is when the immune system produces an exaggerated or inappropriate response that does not normally in occur in most other people. It can be severe, is usually reproducible and may also occur with other structurally related medicines. Symptoms and signs are usually rapid in onset, i.e. within one to two hours of taking the medicine, and include: Urticaria, Angioedema, Bronchospasm, Anaphylaxis. […] Delayed immune reactions can occur several days after antibiotic treatment is begun, and are generally mediated by T-cells (IgG-mediated). Macular, papular or morbilliform rash is a common example of a delayed reaction to antibiotics, and it is often difficult to tell whether this rash is caused by the infection or the treatment. More serious delayed immune reactions generally involve rash in conjunction with systemic symptoms, including: Serum sickness-like reaction onset several days after treatment and characterised by vasculitic rash, arthralgia, flu-like symptoms and sometimes proteinuria. This is most commonly seen in patients taking cephalosporins, particularly cefaclor, and sulfonamides. Stevens-Johnson syndrome a form of toxic epidermal necrolysis, characterised by a red-purple rash and blistering of skin and mucous membranes. This is most commonly associated with the use of sulfonamides. Aseptic meningitis can be induced with use of antibiotics such as trimethoprim or co-trimoxazole. The exact mechanism for this reaction is unknown.

• #40 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Less-common penicillin allergy reactions occur days or weeks after exposure to the drug and may persist for some time after you stop taking it. These conditions include: Serum sickness, which may cause fever, joint pain, rash, swelling and nausea, Drug-induced anemia, a reduction in red blood cells, which can cause fatigue, irregular heartbeats, shortness of breath, and other signs and symptoms, Drug reaction with eosinophilia and systemic symptoms (DRESS), which results in rash, high white blood cell counts, general swelling, swollen lymph nodes and recurrence of dormant hepatitis infection, Stevens-Johnson syndrome or toxic epidermal necrolysis, which involves severe blistering and peeling of the skin, Inflammation in the kidneys (nephritis), which can cause fever, blood in the urine, general swelling, confusion, and other signs and symptoms.

• #41 Penicillin allergy: Definition, treatment, and more

  https://www.medicalnewstoday.com/articles/penicillin-allergy

  Delayed reactions may occur days to weeks after a person takes penicillin and may involve: toxic epidermal necrolysis, a life threatening skin reaction; hemolytic anemia, a blood condition where the body destroys red blood cells faster than it can replace them; Stevens-Johnson Syndrome, a serious reaction to medication that affects the skin and mucous membranes; interstitial nephritis, a kidney disorder that can lead to kidney failure; vasculitis, inflammation of the blood vessels; serum sickness, a hypersensitivity disorder that is similar to an allergy; neutropenia, a condition where the body has too few of a type of white blood cells called neutrophils; thrombocytopenia, a condition that manifests in bleeding, bruising, or slow blood clotting following an injury.

• #42 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Less-common penicillin allergy reactions occur days or weeks after exposure to the drug and may persist for some time after you stop taking it. These conditions include: Serum sickness, which may cause fever, joint pain, rash, swelling and nausea, Drug-induced anemia, a reduction in red blood cells, which can cause fatigue, irregular heartbeats, shortness of breath, and other signs and symptoms, Drug reaction with eosinophilia and systemic symptoms (DRESS), which results in rash, high white blood cell counts, general swelling, swollen lymph nodes and recurrence of dormant hepatitis infection, Stevens-Johnson syndrome or toxic epidermal necrolysis, which involves severe blistering and peeling of the skin, Inflammation in the kidneys (nephritis), which can cause fever, blood in the urine, general swelling, confusion, and other signs and symptoms.

• #43 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Less-common penicillin allergy reactions occur days or weeks after exposure to the drug and may persist for some time after you stop taking it. These conditions include: Serum sickness, which may cause fever, joint pain, rash, swelling and nausea, Drug-induced anemia, a reduction in red blood cells, which can cause fatigue, irregular heartbeats, shortness of breath, and other signs and symptoms, Drug reaction with eosinophilia and systemic symptoms (DRESS), which results in rash, high white blood cell counts, general swelling, swollen lymph nodes and recurrence of dormant hepatitis infection, Stevens-Johnson syndrome or toxic epidermal necrolysis, which involves severe blistering and peeling of the skin, Inflammation in the kidneys (nephritis), which can cause fever, blood in the urine, general swelling, confusion, and other signs and symptoms.

• #44 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Delayed reactions are mediated by IgM and IgG which activates the complement system resulting in inflammatory reactions that include Type 2 to 4 hypersensitivity reactions. Serious hypersensitivity reactions include hemolytic anemia, toxic epidermal necrolysis (TEN), Steven’s Johnson Syndrome (SJS), vasculitis, interstitial nephritis, serum sickness, thrombocytopenia, and neutropenia. […] Common cutaneous symptoms are generalized urticaria, flushing, pruritis, and angioedema.

• #45 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  Less-common penicillin allergy reactions occur days or weeks after exposure to the drug and may persist for some time after you stop taking it. These conditions include: Serum sickness, which may cause fever, joint pain, rash, swelling and nausea, Drug-induced anemia, a reduction in red blood cells, which can cause fatigue, irregular heartbeats, shortness of breath, and other signs and symptoms, Drug reaction with eosinophilia and systemic symptoms (DRESS), which results in rash, high white blood cell counts, general swelling, swollen lymph nodes and recurrence of dormant hepatitis infection, Stevens-Johnson syndrome or toxic epidermal necrolysis, which involves severe blistering and peeling of the skin, Inflammation in the kidneys (nephritis), which can cause fever, blood in the urine, general swelling, confusion, and other signs and symptoms.

• #46 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Delayed reactions are mediated by IgM and IgG which activates the complement system resulting in inflammatory reactions that include Type 2 to 4 hypersensitivity reactions. Serious hypersensitivity reactions include hemolytic anemia, toxic epidermal necrolysis (TEN), Steven’s Johnson Syndrome (SJS), vasculitis, interstitial nephritis, serum sickness, thrombocytopenia, and neutropenia. […] Common cutaneous symptoms are generalized urticaria, flushing, pruritis, and angioedema.

• #47 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Delayed reactions are mediated by IgM and IgG which activates the complement system resulting in inflammatory reactions that include Type 2 to 4 hypersensitivity reactions. Serious hypersensitivity reactions include hemolytic anemia, toxic epidermal necrolysis (TEN), Steven’s Johnson Syndrome (SJS), vasculitis, interstitial nephritis, serum sickness, thrombocytopenia, and neutropenia. […] Common cutaneous symptoms are generalized urticaria, flushing, pruritis, and angioedema.

• #48 Penicillin allergy: Definition, treatment, and more

  https://www.medicalnewstoday.com/articles/penicillin-allergy

  Delayed reactions may occur days to weeks after a person takes penicillin and may involve: toxic epidermal necrolysis, a life threatening skin reaction; hemolytic anemia, a blood condition where the body destroys red blood cells faster than it can replace them; Stevens-Johnson Syndrome, a serious reaction to medication that affects the skin and mucous membranes; interstitial nephritis, a kidney disorder that can lead to kidney failure; vasculitis, inflammation of the blood vessels; serum sickness, a hypersensitivity disorder that is similar to an allergy; neutropenia, a condition where the body has too few of a type of white blood cells called neutrophils; thrombocytopenia, a condition that manifests in bleeding, bruising, or slow blood clotting following an injury.

• #49 Everything You Need to Know About Penicillin Allergies | Jax Allergy

  https://www.jaxallergy.com/everything-you-need-to-know-about-penicillin-allergies/

  However, even with treatment, the signs and symptoms of an allergic reaction to penicillin can last anywhere from 2 to 4 weeks. […] Yes. Of the estimated 1% of the population that truly has an allergy to penicillin, as many as 80% of these individuals report a dramatic decrease in their symptoms 10 years after the first occurrence.

• #50 Penicillin Allergy (for Parents) | Nemours KidsHealth

  https://kidshealth.org/en/parents/penicillin-allergy.html

  Some people have allergic reactions to penicillin or other antibiotics in the penicillin family. […] Many people with a penicillin allergy outgrow it over time. […] When someone has a penicillin allergy, their immune system overreacts to the medicine. […] Signs of an allergic reaction can include: hoarseness or throat tightness, belly pain, vomiting, or diarrhea, itching, hives or red spots, swelling of the face, hands, feet, throat, or tongue, coughing, wheezing, or trouble breathing, a drop in blood pressure, causing dizziness or loss of consciousness (passing out). […] A penicillin allergy sometimes can cause a severe reaction called anaphylaxis. […] Anaphylaxis might start with some of the same symptoms as a less severe reaction, but quickly can get worse. […] Someone with anaphylaxis needs to be treated with an epinephrine auto-injector right away.

• #51 Drug Allergies | Reactions, Symptoms & Treatment | ACAAI Public Website

  https://acaai.org/allergies/allergic-conditions/drug-allergies/

  If you develop a rash, hives or difficulty breathing after taking certain medications, you may have a drug allergy. […] People with drug allergies may experience symptoms regardless of whether their medicine comes in liquid, pill or injectable form. […] Drug Allergy Symptoms include skin rash or hives, itching, wheezing or other breathing problems, swelling, and anaphylaxis, a potentially life-threatening reaction that can simultaneously affect two or more organ systems. […] While you may not experience allergic symptoms the first time you take a drug, your body could be producing antibodies to it. As a result, the next time you take the drug, your immune system may see it as an invader, and you’ll develop symptoms as your body releases chemicals to defend against it. […] These symptoms may include skin rash or hives, itching, wheezing or other breathing problems, swelling, vomiting, feeling dizzy or light-headed, and anaphylaxis, a potentially life-threatening reaction that can impair breathing and send the body into shock.

• #52 Understanding Penicillin Allergy: Symptoms And Risks

  https://www.coastalallergyasthma.com/allergy-overview/allergy-types/drug-allergy/penicillin-allergy/

  Penicillin is typically used for treating bacterial infections. During the first dose of penicillin, it is rare that an allergic reaction will occur. An allergic reaction is usually seen in patients on their second or more exposure to penicillin, and they typically also have a history of food or drug allergies, or a family history of drug allergies. […] Side effects include: skin rash, gives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and/or watery eyes, and anaphylaxis. Symptoms usually occur within an hour after taking the drug, but can sometimes occur hours, days or weeks later. […] Some common symptoms include rash, hives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and watery eyes, or anaphylaxis. Symptoms will typically occur within one hour after taking the drug.

• #53 Understanding Penicillin Allergy: Symptoms And Risks

  https://www.coastalallergyasthma.com/allergy-overview/allergy-types/drug-allergy/penicillin-allergy/

  Other symptoms that may occur after days or weeks include, achy joints, swelling, rash, nausea, drowsiness, fever, blood in the urine, irregular heartbeat and confusion. […] An allergic reaction to penicillin typically occurs in 10% of patients, and can only happen on the second exposure to penicillin. Symptoms may include: rash, hives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and watery eyes, or anaphylaxis. In rare cases are the symptoms life-threatening. You may be at high risk for an allergic reaction if you have other food or drug allergies, or have a family history of a penicillin allergy.

• #54 Understanding Penicillin Allergy: Symptoms And Risks

  https://www.coastalallergyasthma.com/allergy-overview/allergy-types/drug-allergy/penicillin-allergy/

  Penicillin is typically used for treating bacterial infections. During the first dose of penicillin, it is rare that an allergic reaction will occur. An allergic reaction is usually seen in patients on their second or more exposure to penicillin, and they typically also have a history of food or drug allergies, or a family history of drug allergies. […] Side effects include: skin rash, gives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and/or watery eyes, and anaphylaxis. Symptoms usually occur within an hour after taking the drug, but can sometimes occur hours, days or weeks later. […] Some common symptoms include rash, hives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and watery eyes, or anaphylaxis. Symptoms will typically occur within one hour after taking the drug.

• #55 Understanding Penicillin Allergy: Symptoms And Risks

  https://www.coastalallergyasthma.com/allergy-overview/allergy-types/drug-allergy/penicillin-allergy/

  Penicillin is typically used for treating bacterial infections. During the first dose of penicillin, it is rare that an allergic reaction will occur. An allergic reaction is usually seen in patients on their second or more exposure to penicillin, and they typically also have a history of food or drug allergies, or a family history of drug allergies. […] Side effects include: skin rash, gives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and/or watery eyes, and anaphylaxis. Symptoms usually occur within an hour after taking the drug, but can sometimes occur hours, days or weeks later. […] Some common symptoms include rash, hives, itching, fever, swelling, shortness of breath, wheezing, runny nose, itchy and watery eyes, or anaphylaxis. Symptoms will typically occur within one hour after taking the drug.

• #56 Penicillin Allergy – MD Searchlight

  https://mdsearchlight.com/allergy/penicillin-allergy/

  About 10% of patients claim they’re allergic to penicillin, but this is often inaccurate and up to 90% of them don’t have a real allergy. […] The most common reaction is a skin rash. […] Signs and symptoms of Penicillin Allergy include: – Breathing problems – Stomach issues – Changes in mental state – Skin symptoms such as hives, redness, itching, and swelling – Sudden drop in blood pressure – Swelling of the lips, tongue, or throat – Difficulty with swallowing or dealing with saliva – Irregular heartbeat – Unusual sounds when breathing, like wheezing or harsh sounds – Confusion – Belly pain It is important to note that while many people with penicillin allergies will have skin symptoms, these symptoms might be absent in 10% to 20% of allergic reactions. […] Severe allergies to penicillin are typically type 1, caused by an immune system substance called IgE. Higher chances for such reactions occur if penicillin is given in high doses, administered through a vein or muscle (parenteral administration), or used frequently.

• #57 Penicillin Allergy – MD Searchlight

  https://mdsearchlight.com/allergy/penicillin-allergy/

  About 10% of patients claim they’re allergic to penicillin, but this is often inaccurate and up to 90% of them don’t have a real allergy. […] The most common reaction is a skin rash. […] Signs and symptoms of Penicillin Allergy include: – Breathing problems – Stomach issues – Changes in mental state – Skin symptoms such as hives, redness, itching, and swelling – Sudden drop in blood pressure – Swelling of the lips, tongue, or throat – Difficulty with swallowing or dealing with saliva – Irregular heartbeat – Unusual sounds when breathing, like wheezing or harsh sounds – Confusion – Belly pain It is important to note that while many people with penicillin allergies will have skin symptoms, these symptoms might be absent in 10% to 20% of allergic reactions. […] Severe allergies to penicillin are typically type 1, caused by an immune system substance called IgE. Higher chances for such reactions occur if penicillin is given in high doses, administered through a vein or muscle (parenteral administration), or used frequently.

• #58 What You Need to Know about Penicillin Allergy and Testing | Lockey, Fox, Ledford & Glaum MDs PA

  https://www.allergytampa.com/2019/03/20/what-you-need-to-know-about-penicillin-allergy-and-testing/

  It can be difficult to cope with penicillin allergy. […] If you have had a reaction to a penicillin in the past, it can be difficult and costly to come up with an alternative antibiotic that will work well and not cause an allergic reaction. […] After the initial exposure, the immune system may develop an antibody to the drug if it is deemed harmful. The next time you are exposed to a penicillin, an allergic reaction can occur. […] Rarely, reactions can occur with the first exposure to penicillins. […] Some patients develop an allergy over time due to increased and excessive exposure to the antibiotic through extended and frequent use. […] It is important to note, however, that many patients labeled as being allergic to penicillin are not truly allergic. […] Also, if 10 or more years have past since a reaction, 80 to 90% of people will no longer be allergic.

• #59 Penicillin Allergy – MD Searchlight

  https://mdsearchlight.com/allergy/penicillin-allergy/

  About 10% of patients claim they’re allergic to penicillin, but this is often inaccurate and up to 90% of them don’t have a real allergy. […] The most common reaction is a skin rash. […] Signs and symptoms of Penicillin Allergy include: – Breathing problems – Stomach issues – Changes in mental state – Skin symptoms such as hives, redness, itching, and swelling – Sudden drop in blood pressure – Swelling of the lips, tongue, or throat – Difficulty with swallowing or dealing with saliva – Irregular heartbeat – Unusual sounds when breathing, like wheezing or harsh sounds – Confusion – Belly pain It is important to note that while many people with penicillin allergies will have skin symptoms, these symptoms might be absent in 10% to 20% of allergic reactions. […] Severe allergies to penicillin are typically type 1, caused by an immune system substance called IgE. Higher chances for such reactions occur if penicillin is given in high doses, administered through a vein or muscle (parenteral administration), or used frequently.

• #60 Do you really have a penicillin allergy? – Harvard Health

  https://www.health.harvard.edu/blog/do-you-really-have-a-penicillin-allergy-2019022616017

  Chances are, you or someone you know is one of the 10% of Americans with a documented penicillin allergy. […] True allergies can result from any medication. Symptoms can range from mild, like itching, to severe, like anaphylaxis, which can involve low blood pressure and difficulty breathing. […] Shortness of breath, wheezing, fainting, and chest tightness are all reactions that may indicate anaphylaxis. […] Even patients with severe penicillin allergy histories are often able to take penicillins safely again, because penicillin allergy often does not persist for life. […] Anyone with a positive skin test to penicillin there’s usually itching, redness, and swelling at the site of the skin prick is allergic and should avoid penicillin. […] Although these tests are very useful for diagnosing penicillin allergies that are immediate, there are other types of allergies that may still occur. The most common is a minor drug rash that happens days into the course of antibiotic treatment.

• #61 Penicillin Allergy – MD Searchlight

  https://mdsearchlight.com/allergy/penicillin-allergy/

  The immune system response that causes the allergy gradually reduces over time. Therefore, if you’ve tested positive for a penicillin allergy in the past, each year there’s a 10% decrease in the chance you’ll test positive again. This means that if you stay away from penicillin, after about 10 years, between 80% to 100% of people will test negative for the allergy.

• #62 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Approximately 10% of people in the United States report they are allergic to penicillin antibiotics. However, a research study tested people who thought they had an allergy to penicillin. Of those tested, 9 of 10 people did not have any allergic reaction, meaning they can safely take these very helpful antibiotics. Even better news: many people with true penicillin allergies, even those with serious reactions like anaphylaxis, will outgrow their allergy over time 50% by 5 years and 80% by 10 years after their initial allergic reaction. […] Some symptoms below, such as hives or diarrhea, can be simple side effects of antibiotics, but when any symptoms below begin within minutes to hours after the first dose of an antibiotic, it may be a sign of an allergic reaction (true penicillin allergy).

• #63

  https://www.stvincentsclinic.com.au/newsroom/news/penicillin-allergy

  Immediate allergy (also called immediate hypersensitivity) are reactions that occur within an hour of taking a dose of penicillin. These reactions cause symptoms like hives, swelling, itch, breathing difficulties or, in the most severe cases, anaphylaxis. […] There is also delayed allergies (delayed hypersensitivity) where you developed a flat reddish-purple rash (called a maculopapular rash) within a couple of days of starting a course of antibiotics. […] It is estimated that 50 per cent of people with a penicillin reaction will no longer be allergic five years after their reaction, and 80 per cent will no longer react ten years after their reaction.

• #64 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  10% of U.S. patients report having a penicillin allergy, but less than 1% of the population is truly allergic. […] Approximately 80% of patients with IgE-mediated penicillin allergy lose their sensitivity after 10 years. […] Reactions that occur immediately or usually within one hour. […] Hives: Multiple pink or red raised areas of skin that are intensely itchy. […] Angioedema: Localized edema without hives affecting the abdomen, face, extremities, genitalia, oropharynx or larynx. […] Wheezing and shortness of breath. […] Anaphylaxis. […] Anaphylaxis (severe allergic reaction) must have signs or symptoms in at least two of the following systems: Skin: Hives, flushing, itching, and/or angioedema. […] Respiratory: Cough, nasal congestion, shortness of breath, chest tightness, wheeze, sensation of throat closure or choking, and/or change in voice-quality (laryngeal edema).

• #65 Penicillin allergies: What parents need to know | Children’s Mercy Kansas City

  https://www.childrensmercy.org/parent-ish/2024/03/penicillin-allergies/

  Approximately 10% of people in the United States report they are allergic to penicillin antibiotics. However, a research study tested people who thought they had an allergy to penicillin. Of those tested, 9 of 10 people did not have any allergic reaction, meaning they can safely take these very helpful antibiotics. Even better news: many people with true penicillin allergies, even those with serious reactions like anaphylaxis, will outgrow their allergy over time 50% by 5 years and 80% by 10 years after their initial allergic reaction. […] Some symptoms below, such as hives or diarrhea, can be simple side effects of antibiotics, but when any symptoms below begin within minutes to hours after the first dose of an antibiotic, it may be a sign of an allergic reaction (true penicillin allergy).

• #66 Do You Really Have a Penicillin Allergy?

  https://mydoctor.kaiserpermanente.org/mas/news/do-you-really-have-a-penicillin-allergy-2280434

  Oftentimes, people who are allergic to penicillin develop a rash. The rash can develop after the first or second doses of penicillin, or it can first show up several days after completing the course of antibiotics. […] Some people have an immediate allergic reaction to penicillin, which can include a rash, hives and swelling. Hives and swelling usually appear within an hour or less of taking penicillin. Sometimes, people have a severe allergic reaction known as anaphylaxis. Symptoms of anaphylaxis include difficulty breathing, dizziness, vomiting and loss of consciousness. Anaphylaxis is a medical emergency; call 911. […] Research shows that approximately 10 percent of patients report an allergy to penicillin, but with testing, we find that less than 1 percent of people really are allergic! […] Yes! In fact, outgrowing a penicillin allergy is very common. We don’t know why this happens but generally, most people who are diagnosed as allergic to penicillin are found to be non-allergic especially after 10 years or more.

• #67 Do You Really Have a Penicillin Allergy?

  https://mydoctor.kaiserpermanente.org/mas/news/do-you-really-have-a-penicillin-allergy-2280434

  Oftentimes, people who are allergic to penicillin develop a rash. The rash can develop after the first or second doses of penicillin, or it can first show up several days after completing the course of antibiotics. […] Some people have an immediate allergic reaction to penicillin, which can include a rash, hives and swelling. Hives and swelling usually appear within an hour or less of taking penicillin. Sometimes, people have a severe allergic reaction known as anaphylaxis. Symptoms of anaphylaxis include difficulty breathing, dizziness, vomiting and loss of consciousness. Anaphylaxis is a medical emergency; call 911. […] Research shows that approximately 10 percent of patients report an allergy to penicillin, but with testing, we find that less than 1 percent of people really are allergic! […] Yes! In fact, outgrowing a penicillin allergy is very common. We don’t know why this happens but generally, most people who are diagnosed as allergic to penicillin are found to be non-allergic especially after 10 years or more.

• #68 Penicillin Allergy: Signs, Diagnosis & Treatment

  https://getcurex.com/allergens-and-symptoms/allergy-symptoms-immunotherapy-penicillin-and-related-antibiotics?srsltid=AfmBOop-LkceqATmM2HuEiFp16MN-aoLdW7x_M9YNmmWHvSbxhgRX761

  Facial swelling, as well as swelling of the tongue or throat, is a common reaction to a penicillin allergy. […] If you experience a tight feeling in your chest, shortness of breath, wheezing, or other breathing difficulties, it is a sign of a serious allergic reaction and requires immediate medical attention. […] In extreme cases, penicillin and related antibiotics can cause this severe allergic reaction. Symptoms include difficulty breathing, rapid heartbeat, dizziness, and fainting. […] Many individuals diagnosed with a penicillin allergy earlier in life may indeed outgrow the condition. Studies show that approximately 80% of people remain free of the allergy after about 10 years. […] Allergic reactions can diminish over time due to changes in immune system sensitivity.

• #69 Do You Really Have a Penicillin Allergy?

  https://mydoctor.kaiserpermanente.org/mas/news/do-you-really-have-a-penicillin-allergy-2280434

  Oftentimes, people who are allergic to penicillin develop a rash. The rash can develop after the first or second doses of penicillin, or it can first show up several days after completing the course of antibiotics. […] Some people have an immediate allergic reaction to penicillin, which can include a rash, hives and swelling. Hives and swelling usually appear within an hour or less of taking penicillin. Sometimes, people have a severe allergic reaction known as anaphylaxis. Symptoms of anaphylaxis include difficulty breathing, dizziness, vomiting and loss of consciousness. Anaphylaxis is a medical emergency; call 911. […] Research shows that approximately 10 percent of patients report an allergy to penicillin, but with testing, we find that less than 1 percent of people really are allergic! […] Yes! In fact, outgrowing a penicillin allergy is very common. We don’t know why this happens but generally, most people who are diagnosed as allergic to penicillin are found to be non-allergic especially after 10 years or more.

• #70 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  See your doctor as soon as possible if you experience signs or symptoms of penicillin allergy. It’s important to understand and discuss what is an allergic reaction, what is a typical side effect and what you can tolerate in taking a medication. […] Call 911 or emergency medical help if you experience signs of a severe reaction or suspected anaphylaxis after taking penicillin.

• #71 How to Know if You’re Really Allergic to Penicillin | Banner

  https://www.bannerhealth.com/healthcareblog/advise-me/think-you-have-a-penicillin-allergy-maybe-not-according-to-an-expert

  If your provider thinks you may have a penicillin allergy, they may refer you to an allergist, Dr. Shroff said. Penicillin allergy testing is very safe, though many people don’t need it if their risk of allergy is low or negligible. […] Depending on your history, symptoms and risk factors, your provider may recommend one of these options to test for a penicillin allergy: […] Skin prick test: A small amount of penicillin extract is placed on your skin, usually on the forearm or back. Then, a provider pricks your skin with a tiny needle to put the penicillin under it. If you’re allergic to penicillin, you’ll have a red bump there within 15 to 20 minutes. […] If these tests don’t show signs of a penicillin allergy, you may move on to an oral challenge. That’s where you take several small doses of penicillin by mouth, and you are monitored for the next hour or two for any reaction.

• #72 Penicillin Allergy FAQ

  https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/penicillin-allergy-faq

  Approximately 10% of patients report an allergy to penicillin. However, the majority of patients (greater than 90%) may not truly be allergic. Most people lose their penicillin allergy over time, even patients with a history of severe reaction such as anaphylaxis. […] A skin prick test, also called a scratch test, checks for immediate allergy and is the first step in skin testing. Skin prick testing is usually not painful. […] The test, if positive, will cause local itching and redness with swelling at the site where the test is performed. These reactions usually resolve in an hour or so. Systemic reactions such as hives can occur, but are very rare and allergist / immunologists are prepared to treat such reactions. […] The typical process of desensitization has excellent success for patients who have experienced immediate reactions to penicillin and involves introduction of very tiny doses of the penicillin drug either orally or intravenously every 15-20 minutes over a period of 4 hours or so. At the end of this process, most patients can be safely treated with penicillin and dosed normally. However the procedure is only temporary and once treatment has finished, a repeat desensitization would be required if the antibiotic is needed again in the future.

• #73 How to Know if You’re Really Allergic to Penicillin | Banner

  https://www.bannerhealth.com/healthcareblog/advise-me/think-you-have-a-penicillin-allergy-maybe-not-according-to-an-expert

  If your provider thinks you may have a penicillin allergy, they may refer you to an allergist, Dr. Shroff said. Penicillin allergy testing is very safe, though many people don’t need it if their risk of allergy is low or negligible. […] Depending on your history, symptoms and risk factors, your provider may recommend one of these options to test for a penicillin allergy: […] Skin prick test: A small amount of penicillin extract is placed on your skin, usually on the forearm or back. Then, a provider pricks your skin with a tiny needle to put the penicillin under it. If you’re allergic to penicillin, you’ll have a red bump there within 15 to 20 minutes. […] If these tests don’t show signs of a penicillin allergy, you may move on to an oral challenge. That’s where you take several small doses of penicillin by mouth, and you are monitored for the next hour or two for any reaction.

• #74 Penicillin Allergy FAQ

  https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/penicillin-allergy-faq

  Approximately 10% of patients report an allergy to penicillin. However, the majority of patients (greater than 90%) may not truly be allergic. Most people lose their penicillin allergy over time, even patients with a history of severe reaction such as anaphylaxis. […] A skin prick test, also called a scratch test, checks for immediate allergy and is the first step in skin testing. Skin prick testing is usually not painful. […] The test, if positive, will cause local itching and redness with swelling at the site where the test is performed. These reactions usually resolve in an hour or so. Systemic reactions such as hives can occur, but are very rare and allergist / immunologists are prepared to treat such reactions. […] The typical process of desensitization has excellent success for patients who have experienced immediate reactions to penicillin and involves introduction of very tiny doses of the penicillin drug either orally or intravenously every 15-20 minutes over a period of 4 hours or so. At the end of this process, most patients can be safely treated with penicillin and dosed normally. However the procedure is only temporary and once treatment has finished, a repeat desensitization would be required if the antibiotic is needed again in the future.

• #75 Penicillin Allergy FAQ

  https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/penicillin-allergy-faq

  Approximately 10% of patients report an allergy to penicillin. However, the majority of patients (greater than 90%) may not truly be allergic. Most people lose their penicillin allergy over time, even patients with a history of severe reaction such as anaphylaxis. […] A skin prick test, also called a scratch test, checks for immediate allergy and is the first step in skin testing. Skin prick testing is usually not painful. […] The test, if positive, will cause local itching and redness with swelling at the site where the test is performed. These reactions usually resolve in an hour or so. Systemic reactions such as hives can occur, but are very rare and allergist / immunologists are prepared to treat such reactions. […] The typical process of desensitization has excellent success for patients who have experienced immediate reactions to penicillin and involves introduction of very tiny doses of the penicillin drug either orally or intravenously every 15-20 minutes over a period of 4 hours or so. At the end of this process, most patients can be safely treated with penicillin and dosed normally. However the procedure is only temporary and once treatment has finished, a repeat desensitization would be required if the antibiotic is needed again in the future.

• #76 How to Know if You’re Really Allergic to Penicillin | Banner

  https://www.bannerhealth.com/healthcareblog/advise-me/think-you-have-a-penicillin-allergy-maybe-not-according-to-an-expert

  If your provider thinks you may have a penicillin allergy, they may refer you to an allergist, Dr. Shroff said. Penicillin allergy testing is very safe, though many people don’t need it if their risk of allergy is low or negligible. […] Depending on your history, symptoms and risk factors, your provider may recommend one of these options to test for a penicillin allergy: […] Skin prick test: A small amount of penicillin extract is placed on your skin, usually on the forearm or back. Then, a provider pricks your skin with a tiny needle to put the penicillin under it. If you’re allergic to penicillin, you’ll have a red bump there within 15 to 20 minutes. […] If these tests don’t show signs of a penicillin allergy, you may move on to an oral challenge. That’s where you take several small doses of penicillin by mouth, and you are monitored for the next hour or two for any reaction.

• #77 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  Cardiovascular: Hypotension, faintness, tachycardia or less commonly bradycardia, tunnel vision, chest pain, sense of impending doom and/or loss of consciousness. […] Gastrointestinal: Nausea, vomiting, abdominal cramping, and diarrhea. […] A positive result means the patient is likely to have a penicillin allergy. If negative, a skin test is usually followed by an oral penicillin class challenge (like amoxicillin) to safely rule out an IgE-mediated penicillin allergy. […] The skin test and challenge described here are not appropriate for patients with these severe hypersensitivity syndromes. […] Many cephalosporins, especially in the later generations, can be safely tolerated despite a penicillin allergy. […] Children who receive amoxicillin or ampicillin and have Epstein-Barr virus infection can develop a non-allergic, non-pruritic rash, that can appear similar to an allergic reaction.

• #78 How to Know if You’re Really Allergic to Penicillin | Banner

  https://www.bannerhealth.com/healthcareblog/advise-me/think-you-have-a-penicillin-allergy-maybe-not-according-to-an-expert

  If these tests don’t show signs of a penicillin allergy, your doctor will likely decide that you don’t have one and recommend taking it off your medical record. […] But what if testing shows that you are? There are still lots of antibiotics that can work for you. If you need one, you can talk to your provider about what might work best, with the lowest risk of side effects.

• #79 Penicillin Allergy

  https://plushcare.com/blog/penicillin-allergy/

  Even with treatment, the symptoms of a penicillin allergy, including allergy rash and skin inflammation, can last between 24 weeks. […] If you know you have a penicillin allergy, there are some things you should do to ensure your safety: Tell all healthcare workers that you encounter about your penicillin allergy. Make sure it’s clearly marked in your medical and dental records. Wear a penicillin allergy bracelet to alert emergency medical personnel to your allergy if you are unconscious and unable to tell them yourself. Carry emergency epinephrine such as an EpiPen. If you suffer from a life-threatening penicillin allergy, your doctor can prescribe you emergency epinephrine that can stop or reverse an anaphylactic reaction.

• #80 Penicillin Allergy FAQ

  https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/penicillin-allergy-faq

  It is generally recommended that you avoid all drugs in the immediate penicillin family (amoxicillin, ampicillin, amoxicillin-clavulanate, dicloxacillin, nafcillin, piperacillin-tazobactam as well as certain drugs in the cephalosporin class (a closely related class to penicillins). Although the cephalosporins are close relatives of penicillins and share a structure called the beta-lactam ring, the risk of a cross-reactivity reaction between penicillins and cephalosporins remains 5%. Therefore, even with a true allergy to penicillin, there is an excellent chance you could tolerate cephalosporins.

• #81 Penicillin Allergy – Australasian Society of Clinical Immunology and Allergy (ASCIA)

  https://www.allergy.org.au/patients/drug-allergy/penicillin

  Many people are told that they have a penicillin allergy, or think that they have penicillin allergy, and are labelled with a penicillin allergy in their medical record. A person might be incorrectly labelled with having a penicillin allergy when: […] They have symptoms such as rash, itching, or stomach upset while taking penicillin. These symptoms may not be a true penicillin allergy and may be side effects of the medicine or caused by the illness itself (for example, a rash from a viral infection such as flu or glandular fever) […] Studies have shown that up to nine in ten of these people do not have a true penicillin allergy. […] If a true penicillin allergy is diagnosed after testing: […] Your doctor will advise you to avoid the penicillin you have tested positive to. A drug allergy specialist will tell you if you are able to safely take other types of penicillin. If you are allergic to all penicillins, other antibiotics will be prescribed for bacterial infections.

• #82 Penicillin Allergy FAQ

  https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/penicillin-allergy-faq

  Approximately 10% of patients report an allergy to penicillin. However, the majority of patients (greater than 90%) may not truly be allergic. Most people lose their penicillin allergy over time, even patients with a history of severe reaction such as anaphylaxis. […] A skin prick test, also called a scratch test, checks for immediate allergy and is the first step in skin testing. Skin prick testing is usually not painful. […] The test, if positive, will cause local itching and redness with swelling at the site where the test is performed. These reactions usually resolve in an hour or so. Systemic reactions such as hives can occur, but are very rare and allergist / immunologists are prepared to treat such reactions. […] The typical process of desensitization has excellent success for patients who have experienced immediate reactions to penicillin and involves introduction of very tiny doses of the penicillin drug either orally or intravenously every 15-20 minutes over a period of 4 hours or so. At the end of this process, most patients can be safely treated with penicillin and dosed normally. However the procedure is only temporary and once treatment has finished, a repeat desensitization would be required if the antibiotic is needed again in the future.

• #83 Penicillin Allergy – STI Treatment Guidelines

  https://www.cdc.gov/std/treatment-guidelines/penicillin-allergy.htm

  High-risk symptom histories include development of the following after penicillin or -lactam administration: anaphylaxis within 6 hours or severe adverse cutaneous reaction (e.g., eosinophilia and systemic symptoms, Stevens-Johnson syndrome, toxic epidermal necrolysis, or acute generalized exanthematous pustulosis), and other severe non-IgE-mediated reactions (e.g., kidney or hepatic injury, hemolytic anemia, or thrombocytopenia). […] Desensitization is required for persons who have a documented penicillin allergy and for whom no therapeutic alternatives exist (e.g., syphilis during pregnancy and persons with neurosyphilis).

• #84 Penicillin Allergy

  https://plushcare.com/blog/penicillin-allergy/

  Even with treatment, the symptoms of a penicillin allergy, including allergy rash and skin inflammation, can last between 24 weeks. […] If you know you have a penicillin allergy, there are some things you should do to ensure your safety: Tell all healthcare workers that you encounter about your penicillin allergy. Make sure it’s clearly marked in your medical and dental records. Wear a penicillin allergy bracelet to alert emergency medical personnel to your allergy if you are unconscious and unable to tell them yourself. Carry emergency epinephrine such as an EpiPen. If you suffer from a life-threatening penicillin allergy, your doctor can prescribe you emergency epinephrine that can stop or reverse an anaphylactic reaction.

• #85 Penicillin Allergy

  https://plushcare.com/blog/penicillin-allergy/

  Even with treatment, the symptoms of a penicillin allergy, including allergy rash and skin inflammation, can last between 24 weeks. […] If you know you have a penicillin allergy, there are some things you should do to ensure your safety: Tell all healthcare workers that you encounter about your penicillin allergy. Make sure it’s clearly marked in your medical and dental records. Wear a penicillin allergy bracelet to alert emergency medical personnel to your allergy if you are unconscious and unable to tell them yourself. Carry emergency epinephrine such as an EpiPen. If you suffer from a life-threatening penicillin allergy, your doctor can prescribe you emergency epinephrine that can stop or reverse an anaphylactic reaction.

• #86 Penicillin Allergy FAQ

  https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/penicillin-allergy-faq

  It is generally recommended that you avoid all drugs in the immediate penicillin family (amoxicillin, ampicillin, amoxicillin-clavulanate, dicloxacillin, nafcillin, piperacillin-tazobactam as well as certain drugs in the cephalosporin class (a closely related class to penicillins). Although the cephalosporins are close relatives of penicillins and share a structure called the beta-lactam ring, the risk of a cross-reactivity reaction between penicillins and cephalosporins remains 5%. Therefore, even with a true allergy to penicillin, there is an excellent chance you could tolerate cephalosporins.

• #87 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  Cardiovascular: Hypotension, faintness, tachycardia or less commonly bradycardia, tunnel vision, chest pain, sense of impending doom and/or loss of consciousness. […] Gastrointestinal: Nausea, vomiting, abdominal cramping, and diarrhea. […] A positive result means the patient is likely to have a penicillin allergy. If negative, a skin test is usually followed by an oral penicillin class challenge (like amoxicillin) to safely rule out an IgE-mediated penicillin allergy. […] The skin test and challenge described here are not appropriate for patients with these severe hypersensitivity syndromes. […] Many cephalosporins, especially in the later generations, can be safely tolerated despite a penicillin allergy. […] Children who receive amoxicillin or ampicillin and have Epstein-Barr virus infection can develop a non-allergic, non-pruritic rash, that can appear similar to an allergic reaction.

• #88 Penicillin allergy

  https://eastkentformulary.nhs.uk/therapeutic-sections/5-infection/antimicrobial-guide-primary-care/supporting-information-antimicrobials/penicillin-allergy/

  Patients who are truely allergic to one penicillin will be allergic to all because the hypersensitivity is related to the basic penicillin structure. […] More commonly penicillin hypersensitivity manifests as a rash, the typical presentation being a maculopapular, erythematous rash symmetrically disposed over the legs, buttocks and trunk. […] Patients with a definite history of non-urticarial rash allergy to penicillin should not receive a penicillin but the likelihood of serious cross-sensitivity with cephalosporins or carbapenems is very low so other non-penicillin beta lactam antibiotics can be used in these patients. […] Very rarely penicillins can cause pemphigus vulgaris or pemphigoid-like reactions. […] Patients often describe side effects such as diarrhoea or nausea as allergies, so careful history taking is extremely important to distinguish between true allergy and manageable side effects.

• #89 Children and Penicillin Allergic Reactions

  https://www.verywellhealth.com/penicillin-allergies-2634584

  Although an allergic reaction may be triggered within minutes to hours of taking a dose of penicillin, it may take days or weeks for an antibiotic to trigger hives in your child. […] Most importantly, keep in mind that many parents think their children are allergic to penicillin when in fact they aren’t.

• #90 Penicillin allergy

  https://eastkentformulary.nhs.uk/therapeutic-sections/5-infection/antimicrobial-guide-primary-care/supporting-information-antimicrobials/penicillin-allergy/

  Similarly patients reporting minor rashes restricted to small areas of the body, or who develop rashes more than 72 hours after exposure, probably do not have genuine hypersensitivity. […] It is also worth noting that maculo-papular rashes can also occur in patients treated with either ampicillin or amoxicillin who have concomitant viral infections such as glandular fever. Such reactions are not allergic phenomena and do not contra-indicate future use of these or related drugs.

• #91 Clinical Features of Penicillin Allergy | Antibiotic Prescribing and Use | CDC

  https://www.cdc.gov/antibiotic-use/hcp/clinical-signs/index.html

  Cardiovascular: Hypotension, faintness, tachycardia or less commonly bradycardia, tunnel vision, chest pain, sense of impending doom and/or loss of consciousness. […] Gastrointestinal: Nausea, vomiting, abdominal cramping, and diarrhea. […] A positive result means the patient is likely to have a penicillin allergy. If negative, a skin test is usually followed by an oral penicillin class challenge (like amoxicillin) to safely rule out an IgE-mediated penicillin allergy. […] The skin test and challenge described here are not appropriate for patients with these severe hypersensitivity syndromes. […] Many cephalosporins, especially in the later generations, can be safely tolerated despite a penicillin allergy. […] Children who receive amoxicillin or ampicillin and have Epstein-Barr virus infection can develop a non-allergic, non-pruritic rash, that can appear similar to an allergic reaction.

• #92 Penicillin allergy

  https://eastkentformulary.nhs.uk/therapeutic-sections/5-infection/antimicrobial-guide-primary-care/supporting-information-antimicrobials/penicillin-allergy/

  Similarly patients reporting minor rashes restricted to small areas of the body, or who develop rashes more than 72 hours after exposure, probably do not have genuine hypersensitivity. […] It is also worth noting that maculo-papular rashes can also occur in patients treated with either ampicillin or amoxicillin who have concomitant viral infections such as glandular fever. Such reactions are not allergic phenomena and do not contra-indicate future use of these or related drugs.

• #93 Children and Penicillin Allergic Reactions

  https://www.verywellhealth.com/penicillin-allergies-2634584

  A penicillin allergy can cause life-threatening allergic reactions, but fortunately, most kids with a penicillin allergy have more mild reactions, leading to simple skin rashes such as hives. […] Children with more severe symptoms will experience hives as well as wheezing, difficulty breathing or swallowing, or swelling in their mouth or throat, as well as anaphylaxis a serious allergic reaction. […] If your child just has hives (also called urticaria), you will likely notice red or pink raised areas on your child’s skin that are itchy, varied in size, and come and go over several hours. […] Erythema multiforme is an uncommon type of immune system reaction that can also be caused by a penicillin allergy or things like other drugs, bacterial infections, or viral infections. […] Other symptoms of erythema multiforme can include fever, joint aches, mouth sores, and red eyes.

• #94 Children and Penicillin Allergic Reactions

  https://www.verywellhealth.com/penicillin-allergies-2634584

  Although an allergic reaction may be triggered within minutes to hours of taking a dose of penicillin, it may take days or weeks for an antibiotic to trigger hives in your child. […] Most importantly, keep in mind that many parents think their children are allergic to penicillin when in fact they aren’t.

• #95 Blog | Do you have a true penicillin allergy? | Reid Health

  https://www.reidhealth.org/blog/do-you-have-a-true-penicillin-allergy

  A true penicillin allergy is the number one most common cause of allergies to antibiotics says Dr. Casselman. An allergic reaction is your body’s immune response to encountering a substance in your body in this case penicillin it thinks it has to fight says Dr. Casselman. This creates your symptoms which most commonly include hives rash and itching. […] If you do experience a rash or any allergic symptoms while taking any antibiotics call your doctor immediately to prescribe a different antibiotic for you. Continuing the same antibiotic could result in worsening your allergy symptoms and even anaphylaxis so always discontinue any antibiotic that is questionable says Dr. Casselman.

• #96 Penicillin Allergy: Causes & Symptoms

  https://my.clevelandclinic.org/health/diseases/16624-penicillin-allergies

  If you believe you’re having a reaction to penicillin or to any medication you’re taking, call the healthcare provider who prescribed it to you. Call 911 or visit the emergency room if you have symptoms of anaphylaxis like swelling throughout your body or difficulty breathing. You may need emergency treatment to stop these symptoms. […] You may have a penicillin allergy if you experience the following symptoms: A skin rash. Swelling throughout your body. Severe nausea and vomiting or diarrhea. Difficulty breathing. […] An allergic reaction can be life-threatening if left untreated. If you have severe symptoms, call 911 or your local emergency services number or visit the emergency room immediately.

• #97 THE FACTS ABOUT PENICILLIN ALLERGY: A REVIEW

  https://pmc.ncbi.nlm.nih.gov/articles/PMC3255391/

  Anaphylaxis, characterized by symptomatic hypotension with associated dyspnoea, urticaria, and possibly gastrointestinal (GI) symptoms, is the most severe manifestation of IgE-mediated drug allergy. It is most common after parenteral drug administration and is rare with oral or cutaneous exposure. Anaphylaxis results when antigen-specific IgE is present on mast cells and a systemic exposure to antigen occurs, cross-linking the IgE. This results in the simultaneous degranulation of large numbers of mast cells. […] A mild allergic reaction can be treated with an antihistaminics like diphenhydramine, which helps relieve itching and skin rash. However, serious anaphylactic reactions require the urgent administration of adrenalin to counter the cardiac collapse as well as corticosteroids to counteract the effect of the mediators released from the mast cell. In the case of a true anaphylactic hypersensitivity reaction, a patient may die unless controlled with adrenaline and their airway is maintained.

• #98

  https://www.nhs.uk/conditions/antibiotics/side-effects/

  Rarely, some people may have an allergic reaction to antibiotics, especially penicillin and cephalosporins. […] In most cases, the allergic reaction is mild to moderate and can take the form of: a raised, itchy skin rash (urticaria, or hives), coughing, wheezing, tightness of the throat, which can cause breathing difficulties. […] In rare cases, an antibiotic can cause a severe and potentially life-threatening allergic reaction known as anaphylaxis. […] Call 999 or go to AE now if: you have a skin rash that may include itchy, red, swollen, blistered or peeling skin, you’re wheezing, you have tightness in your chest or throat, you have trouble breathing or talking, your mouth, face, lips, tongue or throat start swelling. […] You could be having a serious allergic reaction and may need immediate treatment in hospital.

• #99 Penicillin allergy | Altru Health System

  https://www.altru.org/health-library/conditions/penicillin-allergy

  See your doctor as soon as possible if you experience signs or symptoms of penicillin allergy. It’s important to understand and discuss what is an allergic reaction, what is a typical side effect and what you can tolerate in taking a medication. […] Call 911 or emergency medical help if you experience signs of a severe reaction or suspected anaphylaxis after taking penicillin.

• #100 Penicillin Allergy (for Parents) | Nemours KidsHealth

  https://kidshealth.org/en/parents/penicillin-allergy.html

  Some people have allergic reactions to penicillin or other antibiotics in the penicillin family. […] Many people with a penicillin allergy outgrow it over time. […] When someone has a penicillin allergy, their immune system overreacts to the medicine. […] Signs of an allergic reaction can include: hoarseness or throat tightness, belly pain, vomiting, or diarrhea, itching, hives or red spots, swelling of the face, hands, feet, throat, or tongue, coughing, wheezing, or trouble breathing, a drop in blood pressure, causing dizziness or loss of consciousness (passing out). […] A penicillin allergy sometimes can cause a severe reaction called anaphylaxis. […] Anaphylaxis might start with some of the same symptoms as a less severe reaction, but quickly can get worse. […] Someone with anaphylaxis needs to be treated with an epinephrine auto-injector right away.

• #101 Penicillin | healthdirect

  https://www.healthdirect.gov.au/penicillin

  If someone takes penicillin and has trouble breathing, swelling of the face, throat or tongue, wheeze or cough, difficulty talking, dizziness or collapse, it could be anaphylaxis. If the person carries an EpiPen or Anapen auto-injector, use it. Call triple zero (000) and ask for an ambulance. If they are unresponsive and not breathing, start CPR. […] About 1 in 100 people has an allergy to penicillin, and about 1 in 3,000 people has a life-threatening allergic reaction to penicillin, known as anaphylaxis. […] If you get skin rashes, hives or mild wheezing after taking this medicine, you might have a penicillin allergy. […] If you have serious trouble breathing (heavy wheezing) or if your face starts swelling, you might have penicillin anaphylaxis. […] Serious side effects of penicillin are rare and include difficulty breathing due to a severe allergic reaction (anaphylaxis).

• #102 Penicillin | healthdirect

  https://www.healthdirect.gov.au/penicillin

  Call triple zero (000) and ask for an ambulance or ask someone to take you to the nearest emergency department immediately if you experience any serious side effects after taking penicillin (such as anaphylaxis). […] See your doctor if you are taking penicillin and develop non-urgent signs of a penicillin allergy. Call triple zero (000) and ask for an ambulance if you develop serious side effect of penicillin.

• #103 Penicillin Allergy – STI Treatment Guidelines

  https://www.cdc.gov/std/treatment-guidelines/penicillin-allergy.htm

  Penicillin allergy is often overreported, with the majority of patients who report penicillin allergy able to tolerate the medication. […] The overreported prevalence of penicillin allergy is secondary to imprecise use of the term allergy by families and clinicians and lack of clarity to differentiate between immunoglobulin E (IgE)-mediated hypersensitivity reactions, drug intolerances, and other idiosyncratic reactions that can occur days after exposure. […] Approximately 80% of patients with a true IgE-mediated allergic reaction to penicillin have lost the sensitivity after 10 years. […] In a Baltimore, Maryland, STI clinic study, only 7.1% of the patients who reported allergy to penicillin or to another -lactam antibiotic had an objective positive test for penicillin allergy. […] Moreover, in studies that have incorporated penicillin skin testing and graded oral challenge among persons with reported penicillin allergy, the true rates of allergy are low, ranging from 1.5% to 6.1%.

• #104 Think you have a penicillin allergy? The good news is you may not! | Midwest Ear, Nose & Throat Specialists | Blog

  https://mwent.net/think-you-have-a-penicillin-allergy-the-good-news-is-you-may-not/

  Even if someone had a true allergic reaction to penicillin, this particular allergy often dissipates after about ten years. […] Patients can get mislabeled as allergic to penicillin in a number of ways. They may have experienced drug-related side effects like, headaches, nausea or diarrhea, which are not true allergic reactions. Alternatively, they may develop a rash. While rashes can be a sign of an allergic reaction, many rashes that occur with amoxicillin or penicillin are actually caused an underlying viral illness. […] Approximately 10% of patients report an allergy to penicillin. However, most patients (greater than 90%) may not truly be allergic. Most people lose their penicillin allergy over time, even patients with a history of severe reaction such as anaphylaxis. […] A highly sensitive penicillin skin test is available to diagnose penicillin allergy and can be used to determine if you are allergic to penicillin. An allergist / immunologist can perform this testing, and if it is negative, there is a very high chance that the allergy is no longer present.

• #105 Patient education: Allergy to penicillin and related antibiotics (Beyond the Basics) – UpToDate

  https://www.uptodate.com/contents/allergy-to-penicillin-and-related-antibiotics-beyond-the-basics/print

  PENICILLIN ALLERGY OVERVIEW […] Overall, approximately 10 percent of people report some type of unwanted reaction to penicillin, and serious and even fatal allergic reactions do occur. However, most people who believe they are allergic can take penicillin without a problem, either because they were never truly allergic or because their allergy resolved over time. Among people with a convincing history of severe penicillin allergy, only approximately 20 percent will be allergic to penicillin a decade after their initial allergic reaction if they are not exposed to it again during this time period. […] […] […] Adverse reactions — „Adverse reaction” is the medical term for any undesirable reaction caused by a medication. Both allergic and nonallergic adverse reactions can occur. Allergic reactions are caused by the immune system, unlike nonallergic reactions. Nonallergic reactions are much more common. Examples of common nonallergic adverse reactions include upset stomach and diarrhea.

• #106 Penicillin Allergy – Australasian Society of Clinical Immunology and Allergy (ASCIA)

  https://www.allergy.org.au/patients/drug-allergy/penicillin

  Many people are told that they have a penicillin allergy, or think that they have penicillin allergy, and are labelled with a penicillin allergy in their medical record. A person might be incorrectly labelled with having a penicillin allergy when: […] They have symptoms such as rash, itching, or stomach upset while taking penicillin. These symptoms may not be a true penicillin allergy and may be side effects of the medicine or caused by the illness itself (for example, a rash from a viral infection such as flu or glandular fever) […] Studies have shown that up to nine in ten of these people do not have a true penicillin allergy. […] If a true penicillin allergy is diagnosed after testing: […] Your doctor will advise you to avoid the penicillin you have tested positive to. A drug allergy specialist will tell you if you are able to safely take other types of penicillin. If you are allergic to all penicillins, other antibiotics will be prescribed for bacterial infections.

• #107 Think you have a penicillin allergy? The good news is you may not! | Midwest Ear, Nose & Throat Specialists | Blog

  https://mwent.net/think-you-have-a-penicillin-allergy-the-good-news-is-you-may-not/

  Even if someone had a true allergic reaction to penicillin, this particular allergy often dissipates after about ten years. […] Patients can get mislabeled as allergic to penicillin in a number of ways. They may have experienced drug-related side effects like, headaches, nausea or diarrhea, which are not true allergic reactions. Alternatively, they may develop a rash. While rashes can be a sign of an allergic reaction, many rashes that occur with amoxicillin or penicillin are actually caused an underlying viral illness. […] Approximately 10% of patients report an allergy to penicillin. However, most patients (greater than 90%) may not truly be allergic. Most people lose their penicillin allergy over time, even patients with a history of severe reaction such as anaphylaxis. […] A highly sensitive penicillin skin test is available to diagnose penicillin allergy and can be used to determine if you are allergic to penicillin. An allergist / immunologist can perform this testing, and if it is negative, there is a very high chance that the allergy is no longer present.

• #108 Penicillin Allergy – STI Treatment Guidelines

  https://www.cdc.gov/std/treatment-guidelines/penicillin-allergy.htm

  Penicillin allergy is often overreported, with the majority of patients who report penicillin allergy able to tolerate the medication. […] The overreported prevalence of penicillin allergy is secondary to imprecise use of the term allergy by families and clinicians and lack of clarity to differentiate between immunoglobulin E (IgE)-mediated hypersensitivity reactions, drug intolerances, and other idiosyncratic reactions that can occur days after exposure. […] Approximately 80% of patients with a true IgE-mediated allergic reaction to penicillin have lost the sensitivity after 10 years. […] In a Baltimore, Maryland, STI clinic study, only 7.1% of the patients who reported allergy to penicillin or to another -lactam antibiotic had an objective positive test for penicillin allergy. […] Moreover, in studies that have incorporated penicillin skin testing and graded oral challenge among persons with reported penicillin allergy, the true rates of allergy are low, ranging from 1.5% to 6.1%.

• #109 Penicillin Allergy – STI Treatment Guidelines

  https://www.cdc.gov/std/treatment-guidelines/penicillin-allergy.htm

  Penicillin allergy is often overreported, with the majority of patients who report penicillin allergy able to tolerate the medication. […] The overreported prevalence of penicillin allergy is secondary to imprecise use of the term allergy by families and clinicians and lack of clarity to differentiate between immunoglobulin E (IgE)-mediated hypersensitivity reactions, drug intolerances, and other idiosyncratic reactions that can occur days after exposure. […] Approximately 80% of patients with a true IgE-mediated allergic reaction to penicillin have lost the sensitivity after 10 years. […] In a Baltimore, Maryland, STI clinic study, only 7.1% of the patients who reported allergy to penicillin or to another -lactam antibiotic had an objective positive test for penicillin allergy. […] Moreover, in studies that have incorporated penicillin skin testing and graded oral challenge among persons with reported penicillin allergy, the true rates of allergy are low, ranging from 1.5% to 6.1%.

• #110 Penicillin Allergy – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK459320/

  Penicillin is also one of the most frequently reported medication allergies. […] Identification of true penicillin allergy is critical as 80% to 90% of people once considered allergic are ultimately able to tolerate penicillins resulting in the decreased need for broad-spectrum antibiotics and development of multi-drug resistant organisms. […] Serious allergic reactions to penicillin are Type 1 and mediated by IgE. […] The incidence of anaphylaxis to penicillin is 0.02% to 0.04% and is mediated by a type 1 hypersensitivity reaction. Overall, cutaneous eruptions are the most commonly reported reaction. […] Immediate reactions are the result of IgE that cross-like on mast cells when exposed to the antigenic component. The result is degranulation and release of histamine as well as other vasoactive substances. It is the minor antigenic determinates that generate IgE specific responses that are associated with true penicillin allergy. These minor determinates result in immediate reactions, within minutes to 1 hour, and characterized by signs and symptoms of acute anaphylaxis such as urticaria, flushing, dyspnea, bronchospasm with wheezing, angioedema, hypotension, tachycardia, mental status change or gastrointestinal (GI) upset.

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