title: Effect of dose and schedule on cefoperazone pharmacodynamics in an in vitro model of infection in a neutropenic host.
abstract: Previous studies have shown that cefoperazone given in frequent, large doses is effective in the treatment of infection in patients with cancer. The pharmacodynamics of 2- and 4-g doses of cefoperazone administered either as a single dose or at 12-hour intervals were studied in an in vitro model that simulates infection in a neutropenic patient. One strain each of Pseudomonas aeruginosa (minimal inhibitory concentration [MIC] = 2 micrograms/ml), Staphylococcus aureus (MIC = 1 microgram/ml), Escherichia coli (MIC = 0.06 micrograms/ml), and Klebsiella pneumoniae (MIC = 0.25 micrograms/ml) was studied. The initial dose reduced the inoculum by approximately 3 logs for the Pseudomonas and the staphylococci and 3 to 5 logs for the other organisms. No significant differences in killing were found between the 2- and 4-g doses. Regrowth of Pseudomonas and staphylococci occurred with the single dose but not with the every-12-hour regimen. These data support the clinical use of cefoperazone in doses every 12 hours.
authors.affiliation: Department of Medicine, Roger Williams General Hospital, Brown University, Providence, Rhode Island.
authors.forename: S H
authors.initials: SH
authors.lastname: Zinner
authors.forename: M N
authors.initials: MN
authors.lastname: Dudley
authors.forename: D
authors.initials: D
authors.lastname: Gilbert
authors.forename: M
authors.initials: M
authors.lastname: Bassignani
mesh_terms: D000380:Agranulocytosis / Q000150:complications*; D001419:Bacteria / Q000187:drug effects*; D001424:Bacterial Infections / Q000150:complications / Q000382:microbiology*; D002438:Cefoperazone / Q000008:administration & dosage / Q000494:pharmacology*; D004334:Drug Administration Schedule; D007700:Kinetics; D008954:Models, Biological; D009503:Neutropenia / Q000150:complications*
chemical_list: D002438:Cefoperazone