5 doctors weighed in:

Does Bactrim (sulfamethoxazole and trimethoprim) have sulfa. I am allergic to sulfa? Which one is better for UTI Keflex or Bactrim (sulfamethoxazole and trimethoprim)

5 doctors weighed in
Dr. Hunter Handsfield
Internal Medicine - Infectious Disease
4 doctors agree

In brief: Bactrim (sulfamethoxazole and trimethoprim) is sulfa

Bactrim (sulfamethoxazole and trimethoprim) contains a sulfonamide ("sulfa drug") called sulfamethoxazole.
It needs to be avoided by people with sulfa allergy. Cephalexin (Keflex) is less reliable for UTI; many UTI bacteria are resistant to it. Ask your doctor about possible treatment with a quinolone like ciprofloxacin, levofloxacin, and others.

In brief: Bactrim (sulfamethoxazole and trimethoprim) is sulfa

Bactrim (sulfamethoxazole and trimethoprim) contains a sulfonamide ("sulfa drug") called sulfamethoxazole.
It needs to be avoided by people with sulfa allergy. Cephalexin (Keflex) is less reliable for UTI; many UTI bacteria are resistant to it. Ask your doctor about possible treatment with a quinolone like ciprofloxacin, levofloxacin, and others.
Thank
Get help from a real doctor now
Dr. Jane Van Dis
Board Certified, Obstetrics & Gynecology
16 years in practice
47M people helped
Continue
111,000 doctors available