Trimethoprim blocks the production of tetrahydrofolic ... Concomitant dofetilide. Not for group A β-hemolytic strep. Avoid prolonged administration. Monitor CBCs, urine, and renal function.

Trimethoprim (as sulfate) 1 mg, polymyxin B sulfate 10000 Units/mL; oph. soln; contains benzalkonium chloride. Trimethoprim is a synthetic antibacterial drug active against a wide variety of ...