乳酸甲氧苄啶产品是Trimethoprim is an antibacterial agent, primarily active against most gram negative and gram positive aerobic bacteria. Inhibits dihydrofolate reductase. It is used clinically to treat urinary tract infections, mild acute prostatitis, recurrent cystitis, asymptomatic bacteriuria during pregnancy and respiratory tract infections. Trimethoprim lactate salt is used as a selection agent.