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A synthetic combination of two antibacterial agents, trimethoprim and sulfamethoxazole. This synergistic combination, also known as co-trimoxazole, inhibits two sequential steps in the bacterial metabolism of folic acid. Trimethoprim is a pyrimidine inhibitor of dihydrofolate reductase; sulfamethoxazole is a sulfamide inhibitor of bacterial dihydrofolate synthetase. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C909\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C909\' NCI Thesaurus)
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