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The sodium salt of colistimethate, a broad-spectrum polymyxin antibiotic against most aerobic Gram-negative bacteria except Proteus bacteria. Colistimethate sodium contains the pentasodium salt of the penta(methanesulfonic acid) derivative of colistin A as the major component and a small proportion of the petasodium salt of the pentamethanesulfonate derivative of colistin B. Colistins are cyclic polypeptides produced from Bacillus colistinus or B. polymyxa and function as a surfactant which penetrates into and disrupts the bacterial cell membrane, thereby resulting in bactericidal effect. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C65349\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C65349\' NCI Thesaurus)
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