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Carfecillin sodium is an organic sodium salt. It contains a carfecillin(1-). Carbenicillin Phenyl Sodium is the sodium salt of the phenyl ester of carbenicillin, a broad-spectrum, semisynthetic penicillin derivative with antibacterial activity. Following absorption, carbenicillin phenyl sodium is rapidly hydrolyzed to the active carbenicillin, which binds to and inactivates penicillin-binding proteins (PBPs) located on the inner membrane of the bacterial cell wall, thereby preventing the cross-linkage of peptidoglycans, which are critical components of the bacterial cell wall. This leads to a weakening of the bacterial cell wall, eventually causing bacterial cell lysis. The phenyl ester of CARBENICILLIN that, upon oral administration, is broken down in the intestinal mucosa to the active antibacterial. It is used for urinary tract infections.