A member asked:

How can you tell if a child is allergic to antibiotics?

29 doctors weighed in across 10 answers

Rash: The most common allergic reactions to antibiotics include a rash (though not always). Rarely, a more serious reaction can include hives, swelling of the face, lips, tongue or throat, and difficulty breathing. This rare but life threatening allergic reaction (anaphylaxis) can occur within a few minutes to an hour of taking the medication.

Answered 9/29/2016

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Not easy: Though the most common allergic reactions to antibiotics are rashes, most rashes that occur while on antibiotics are not caused by allergies. Many people think they're allergic because of rashes, but in fact they're not. Have the rash examined by your doctor, or take photos, to try to help determine if it's really an allergy. Sometimes, it can be difficult to know for sure.

Answered 12/8/2016

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Dr. Theresa Willett answered

Specializes in Pediatrics

Swelling and/or itch: Babies and rashes go together so often that anything can seem like an allergy. If your baby is on antibiotics, or was recently on some, the most concerning things to see would be face, or lip swelling, or a rash that you can see and feel and seems itchy. It still might be a viral rash, but would be good to have checked. Diarrhea and stomach upset are common side effects but not allergies.

Answered 6/17/2015

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Certain symptoms: This can be difficult to be certain, because many times the infection that the child has causes a rash but the antibiotic is blamed for the rash. Antibiotic allergy can cause rash/hives, swollen lips/tongue/eyelids/face, vomiting, diarrhea, or wheezing. An allergist can perform skin testing (especially accurate for penicillin) that can help diagnose whether your child has an antibiotic allergy.

Answered 5/10/2015

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Usually a rash: Typically if a child is allergic to antibiotics, you'll notice she will develop a rash at some point during the course of antibiotics. The rash can happen in the middle or end of the course of antibiotics. An allergy can also manifest itself with severe stomach upset, particularly vomiting, and rarely, trouble breathing. Call your md right away if you see any of these signs.

Answered 10/3/2016

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A rash develops: If a child is allergic to an antibiotic, he may get a rash during the time he is taking the antibiotic, but some people get a rash a few days or weeks after using the antibiotic. Other symptoms can occur also. With severe allergies, a person can have swelling of the face/lips/tongue, wheezing, difficulty breathing, dizziness, and low blood pressure . . . This type of reaction is an emergency!

Answered 3/31/2018

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Rash: Can have a rash over the body or hives on the body. Should be evaluated by your doctor.

Answered 12/28/2014

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Take a picture: Take a picture then take your child to your pediatrician.Usually children have a viral illness on top of a bacterial infection that requires taking antibiotics and these viral rash never fails to appear when they are on them.They may be treated for strep throat that can cause scarlatina rash and mistaken for allergic reaction.Some parents think diaper rash and diarrhea are allergic reactions!

Answered 9/28/2016

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Dr. Maziar Rezvani answered

Specializes in Allergy and Immunology

Several ways: There are several pathways that cause drug allergy. The classic one is immediate, ige mediated and usually occurs within 1 hour of exposure. There are other pathways which can be delayed from a day to several weeks. You will usually see a type of rash as one of the first symptoms in mos cases but that does not necessarily rule out a hypersensitivity reaction. Monitor all symptoms carefully.

Answered 4/8/2015

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Dr. John Leander Po answered

Specializes in Infectious Disease

Definitively? Test: The most definitive way is to have an allergist specialist test for it. The reason is for this recommendation is that certain infections can cause rashes wrongly attributed to the antibiotic- for example- strept infections can cause a red, sandpaper rash or else, mycoplasma pneumonia manifesting as erythema multiforme). Testing by an experienced technician can really clarify these situations.

Answered 5/1/2012

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