Cotrimoxazole Home>Pharmacy>Drugs_and_Medications>C>Cotrimoxazole     Web Pages TMP-SMX (Bactrim) Trimethoprim-Sulfamethoxazole, TMP-SMX, Septra. Trimeth/Sulfameth Information from the RxList. DrugDigest: Cotrimoxazole Information on dosage, usage, side effects, interactions, and drug comparisons, including generics when available. Sold under brand names sush as: Bactrim, Cotrim, Septra, and Sulfatrim.