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Allergies

Can you outgrow a penicillin allergy?

07/23/2008

Question:

I saw the answer to the question about being told of a pencillin allergy at a very early age. I also was told that I was allergic to pencillin though I have no idea what happened or when. I am now in my early 50`s and recently took one (1) 500 mg amoxicllin before I realized it was a pencillin deriative. I did not have any reaction - I also took cephalexin and I think the only reacion was vaginal itching and some joint pain but I also take Lipitor). Does this mean I can take now these drugs without life threatening side effects?

Answer:

Not exactly. You need to be skin tested to penicillin and possibly the cephalosporins even if the skin tests to penicillin are negative.

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Response by:

I Leonard Bernstein, MD I Leonard Bernstein, MD
Clinical Professor Emeritus
College of Medicine
University of Cincinnati