Sulfamethoxazole Trimethoprim is a combination of antibiotics that work in conjunction with each other. Sulfamethoxazole Trimethoprim is often used to treat urinary tract, skin, respiratory, or digestive tract infections. It may be used for ear infections, kennel cough, coccidiosis, and pneumonia.**We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.**