A 39-year-old member asked:
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how much time does it take for a rash to go away thats an allergic reaction to penicillin?

2 doctor answers
Dr. Maureen Ziboh
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
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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Related questions:

A 34-year-old member asked:
Dr. Glenn Messina
35 years experience Aesthetic Medicine
Several days: Expect to have the rash from 1 to 3 weeks or some remnant of it.
A 33-year-old female asked:
Dr. Oscar Novick
58 years experience Pediatrics
Rash: You certainly can have a rash secondary to the oenivillen.
A 30-year-old male asked:
Dr. J. Lawrence Dohan
57 years experience Dermatology
Possibly: Most people with this history will not react when exposed 20 years later. But some of them will get a rash again.
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A 25-year-old male asked:
Dr. James Ferguson
46 years experience Pediatrics
Basics: Any significant/worrisome allergy to this or any other antibiotic would produce obvious symptoms within hours if not sooner. A minor rash has little s ... Read More
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