A 39-year-old member asked:
how much time does it take for a rash to go away thats an allergic reaction to penicillin?
2 doctor answers
Dr. Maureen Ziboh answered
26 years experience Family Medicine
It varies: It varies up usually by a couple of days to a week
Answered on Jul 16, 2014
Dr. Jay Kashkin answered
38 years experience Allergy and Immunology
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 on Dec 8, 2016
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