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A 42-year-old member asked:

What are the side effects of sulfamethoxazole-tmp--am i allergic to cephalexin?

1 doctor answer1 doctor weighed in
Dr. Martin Raff
Infectious Disease 58 years experience
Allergenic: Tmp (bactrim, septra, (sulfamethoxazole and trimethoprim) etc.) has a sulfonamide as one component. These are among the most allergy creating drugs known and anyone who is developing an allergy to other classes of drugs, like cephalosporins, has a higher risk of also being allergic to sulfa. Be careful !
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Last updated Apr 20, 2013


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