title: Interactions of the 4-quinolones with other antibacterials.
abstract: The effect of sub-inhibitory concentrations of 16 antibacterials on the bactericidal activity of the 4-quinolones nalidixic acid, ciprofloxacin and ofloxacin against Escherichia coli KL16 in nutrient broth was investigated. Sub-inhibitory concentrations of rifampicin, clindamycin, chloramphenicol, erythromycin or tetracycline antagonised the bactericidal activity of the 4-quinolones. Conversely, all seven aminoglycosides tested enhanced the bactericidal activity of the 4-quinolones whereas the cell wall antagonists, azlocillin, mezlocillin, ceftazidime and vancomycin had no effect on the bactericidal activity of the 4-quinolones.
authors.affiliation: Department of Pharmaceutics, School of Pharmacy, London University, Brunswick Square.
authors.forename: C S
authors.initials: CS
authors.lastname: Lewin
authors.forename: J T
authors.initials: JT
authors.lastname: Smith
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D000890:Anti-Infective Agents / Q000494:pharmacology*; D002939:Ciprofloxacin / Q000494:pharmacology; D004347:Drug Interactions; D004926:Escherichia coli / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D009268:Nalidixic Acid / Q000494:pharmacology; D015242:Ofloxacin / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D009268:Nalidixic Acid; D002939:Ciprofloxacin; D015242:Ofloxacin