Article: Penicillin Allergy; New Hemophilia Drug

Q. Is it possible to develop sensitivity to penicillin drugs (like ampicillin) over time? I'm 32 years old and have had many bouts of tonsillitis. My doctor always treated me with penicillin in the past and I never had any problem with it.

During the past year, whenever I've taken any form of penicillin, I've suffered with side effects including stomach cramps, diarrhea and what seems to be a bowel infection.

Can I become allergic to penicillin after years of using it without any difficulties? Should I not take penicillin again in the future?

A. Your question really addresses several complications of using penicillin, or most antibiotics for that matter. I'll discuss these problems one ...

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