Sulfamethoxazole and trimethoprim are both antibiotics that treat different types of infection
caused by bacteria.
The combination of sulfamethoxazole and trimethoprim is used to treat ear infections, urinary
tract infections, bronchitis, traveler's diarrhea, and Pneumocystis carinii pneumonia.
Sulfamethoxazole and trimethoprim may also be used for other purposes not listed in this
medication guide.