Can I take Bactrim (sulfamethoxazole and trimethoprim) ds for tinea bacterial infection?

Kinda, sorta. Bactrim (sulfamethoxazole and trimethoprim) DS is brand name for sulfamethoxazole/trimethoprim, an antibiotic used to treat bacterial infections. As such, it is not used to treat tinea or fungal infections, which require antifungals, some of which are available over-the-counter (while no antibiotics are, at least not in the States). With that said, some fungal infections can become superinfected by bacteria & thus require Bactrim (sulfamethoxazole and trimethoprim) DS.