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A member asked:
How long can an allergic reaction take to show up on penicillin based anibiotics?
A doctor has provided 1 answer
Depends: It depends on the individual. If you've never had a reaction, the first reaction may take several days of therapy to show up. If you've had a previous reaction, the next reaction will usually show up sooner, and greater, than the first reaction, so use caution if you've had a previous reaction.
Answered 7/9/2018
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