title: Superior effect of tazobactam/piperacillin compared to piperacillin on beta-lactamase-producing Pseudomonas aeruginosa.
abstract: To evaluate the synergistic antimicrobial effects of tazobactam (TAZ), a beta-lactamase inhibitor, and piperacillin (PIPC) on Pseudomonas aeruginosa, we compared the antimicrobial effects of TAZ/PIPC with those of PIPC alone on bacteria inducibly or constitutively producing beta-lactamase. TAZ/PIPC had more potent antimicrobial effects compared with PIPC on clinical isolates producing beta-lactamase. In the treatment of mouse systemic infection, the therapeutic effect of PIPC was markedly decreased by beta-lactamase, but that of TAZ/PIPC was only slightly decreased. In the treatment of local infections in mice, the therapeutic effects of PIPC were decreased due to the induction of beta-lactamase and the emergence of bacterial strains constitutively producing beta-lactamase, while those of TAZ/ PIPC were not affected.
authors.affiliation: Antimicrobial Research Lab., Taiho Pharm. Co., Tokushima, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nishida
authors.forename: F
authors.initials: F
authors.lastname: Higashitani
authors.forename: A
authors.initials: A
authors.lastname: Hyodo
mesh_terms: D000818:Animals; D004352:Drug Resistance, Microbial; D004359:Drug Therapy, Combination / Q000494:pharmacology* / Q000627:therapeutic use; D008297:Male; D051379:Mice; D010397:Penicillanic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D010878:Piperacillin / Q000494:pharmacology* / Q000627:therapeutic use; D011552:Pseudomonas Infections / Q000188:drug therapy*; D011550:Pseudomonas aeruginosa / Q000187:drug effects*; D000078142:Tazobactam; D014552:Urinary Tract Infections / Q000188:drug therapy; D001618:beta-Lactamases / Q000378:metabolism
chemical_list: D010397:Penicillanic Acid; D001618:beta-Lactamases; D000078142:Tazobactam; D010878:Piperacillin