Also Known As: Bactrim, Trimethoprim-sulfamethoxazole, Septra, Trimethoprim/sulfamethoxazole, Bactrim DS

Trimethoprim/sulfamethoxazole or co-trimoxazole (abbreviated SXT, TMP-SMX, TMP-SMZ or TMP-sulfa) is a sulfonamide antibiotic combination of trimethoprim and sulfamethoxazole, in the ratio of 1 to 5, used in the treatment of a variety of bacterial infections.

The name co-trimoxazole is the British Approved Name, and has been marketed worldwide under many trade names including Septra (GSK), Bactrim (Roche), and various generic preparations. Sources differ as to whether co-trimoxazole usually is a bactericide or a bacteriostatic agent.

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