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A member asked:
How much time does it take for a rash to go away thats an allergic reaction to penicillin?
3 doctors weighed in across 2 answers
It varies: It varies up usually by a couple of days to a week
Answered 7/16/2014
3.9k views
A day to weeks: There are 2 types of "allergic" reactions, meaning an immune response, that we typically see with penicillin. However there are numerous non allergic or adverse reactions that can occur. For your question, the 2 allergic reactions are Type I and Type III. Type I can be immediately following one dose of Pen or after days. TypeIII can occur a few weeks after stopping! Can only test for Type I.
Answered 12/8/2016
3.5k views
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