Bactrim contains a combination of sulfamethoxazole and trimethoprim and is supplied in tablets and a liquid suspension. Sulfamethoxazole and trimethoprim are both antibiotics that treat different types of infection caused by bacteria.

Bactrim is used to treat ear infections, urinary tract infections, bronchitis, traveler's diarrhea, and Pneumocystis carinii pneumonia.

Bactrim may also be used for other purposes not listed in this medication guide.