[chadd]

it's common to have childhood allergies to penicillin-class drugs which go away in adulthood; i had to have major surgery (as an adult) but had a similar childhood reaction. I was advised to do an allergy 'challenge test'. It turned out the allergy was either never really there or had gone away, which gives doctors more options when antibiotics are needed. It might be worth looking into.

[ianai]

But only “look into it” in a carefully supervised medical center. Don’t go rolling the dice on a severe allergic reaction to an antibiotic at home or outside of that supervision.