Co-trimoxazole (Bactrim) is used for daily prophylaxis against Pneumocystis jirovecii in AIDS. Which of the following is the brand name commonly associated with this drug?

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Co-trimoxazole is the fixed-dose combination of trimethoprim and sulfamethoxazole, widely used for Pneumocystis jirovecii prophylaxis in AIDS. Brand names for this drug vary, but Bactrim is the name most commonly associated with this formulation in everyday clinical practice and exam content. Septra is another brand for the same drug, but Bactrim is the one most people recognize in this context. The other names are less commonly used today, so Bactrim remains the best association.