Definition of "trimethoprim" [trimethoprim]

• An antibiotic, 5-(3,4,5-trimethoxybenzyl)pyrimidine-2,4-diamine, used against, among other infections, those of the urinary tract. (noun)

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• "Ask your doctor for a diarrhea-fighting prescription antibiotic, such as sulfamethoxazole and trimethoprim (Bactrim DS) or ciprofloxacin (Cipro), to treat severe cases accompanied by fever."
• "Those who do get infected with USA300 are commonly treated with the antibiotic Bactrim (trimethoprim-sulfamethoxazole), which is still effective against the infection."
• "Ampicillin and trimethoprim-sulfonamide have been used successfully in the treatment of infections caused by chloramphenicol-resistant strains."