Top of the page
A penicillin allergy is a bad reaction that your body has to penicillin antibiotics. This is the most common type of drug allergy.
The reaction can range from mild to serious. Common allergic reactions include rashes and swelling. But a severe reaction can cause trouble breathing. This can be deadly if not treated right away.
A severe reaction is more likely if you have had:
People who have a penicillin allergy also may react to similar antibiotics. These include ampicillin and amoxicillin. Ask your pharmacist or doctor about these medicines.
A skin test is the best way to find out if you have this allergy.
A mild reaction can cause:
A severe reaction can cause:
If you have any of these severe symptoms, call 911 or other emergency services right away.
A mild reaction often can be treated with antihistamines. These medicines stop swelling and itching. They can be bought without a prescription.
Some people may need prescription medicine if over-the-counter medicine doesn't help.
You also can treat a mild reaction by:
A shot of epinephrine is needed for severe reactions. Sometimes people also get antihistamines and other medicine in a vein.
If you have any reaction to penicillin, let your doctor know right away. Tell other health professionals who treat you that you had a reaction to penicillin.
It's also a good idea to wear medical alert jewellery that lists your allergies.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
Go to https://www.healthwise.net/patientEd
Enter D159 in the search box to learn more about "Learning About Penicillin Allergy".
Current as of: October 7, 2019
Author: Healthwise Staff
Medical Review:Adam Husney MD - Family Medicine & Anne C. Poinier MD - Internal Medicine & Martin J. Gabica MD - Family Medicine
Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.
©2006-2020 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.