Sulfamethoxazole 400mg, trimethoprim 80mg ... Discontinue at the 1 st sign of skin rash or any other serious reaction. Elderly. Embryo-fetal toxicity. Pregnancy. Nursing mothers (IV: not recommended).

Sulfamethoxazole 800mg, trimethoprim 160mg; scored tabs. Sulfamethoxazole inhibits bacterial synthesis of dihydrofolic acid by competing with para-aminobenzoic acid (PABA). Trimethoprim blocks the ...