or chiefly Brit  sul*pha*meth*ox*a*zole  n :  an antibacterial sulfonamide C₁₀H₁₁N₃O₃S used alone (as in the treatment of urinary tract infections or prophylaxis against meningococcal meningitis) or in combination with trimethoprim (as in the treatment of Pneumocystis carinii pneumonia, shigellosis, acute otitis media, or urinary tract infections) - see BACTRIM  .
 
 
 
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