Used primarily to treat bacterial infections, especially urinary tract infections, respiratory infections, and ear infections. It works by inhibiting bacterial folic acid synthesis, which is essential for DNA and protein production in bacteria. Commonly combined with sulfamethoxazole to enhance effectiveness, this combination is used for treating bronchitis, traveler’s diarrhea, and certain types of pneumonia. Also used in veterinary medicine and as a preventive treatment in individuals with recurrent infections.