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A female asked:

How long does a septra (sulfamethoxazole and trimethoprim) rash last?

1 doctor answer3 doctors weighed in
Dr. Michael Silverman
Specializes in Infectious Disease
1 week or so: Depending on the severity it can last a couple days to 10-14 days but usually less ...Depends on how long you took the med and when you stopped it in relation to the onset of the rash.
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Last updated Oct 3, 2016


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