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A member asked:

How much time would it take for a reaction to bactrim (sulfamethoxazole and trimethoprim) develop ?

A doctor has provided 1 answer

Drug allergy: Most reactions to medications develop fairly soon after starting the medication. A reaction may occur almost immediately, or after a few days, and sometimes may occur even after you have completed the course of the medication. Usually, you will know while taking it that you have a problem.

Answered 12/10/2018

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