title: New classification and update on the quinolone antibiotics.
abstract: The newer fluoroquinolones have broad-spectrum bactericidal activity, excellent oral bioavailability, good tissue penetration and favorable safety and tolerability profiles. A new four-generation classification of the quinolone drugs takes into account the expanded antimicrobial spectrum of the more recently introduced fluoroquinolones and their clinical indications. First-generation drugs (e.g., nalidixic acid) achieve minimal serum levels. Second-generation quinolones (e.g., ciprofloxacin) have increased gram-negative and systemic activity. Third-generation drugs (e.g., levofloxacin) have expanded activity against gram-positive bacteria and atypical pathogens. Fourth-generation quinolone drugs (currently only trovafloxacin) add significant activity against anaerobes. The quinolones can be differentiated within classes based on their pharmacokinetic properties. The new classification can help family physicians prescribe these drugs appropriately.
authors.affiliation: East Carolina University School of Medicine, Greenville, North Carolina, USA.
authors.forename: D E
authors.initials: DE
authors.lastname: King
authors.forename: R
authors.initials: R
authors.lastname: Malone
authors.forename: S H
authors.initials: SH
authors.lastname: Lilley
mesh_terms: D000890:Anti-Infective Agents / Q000627:therapeutic use*; D002939:Ciprofloxacin / Q000627:therapeutic use; D024841:Fluoroquinolones; D006801:Humans; D009287:Naphthyridines / Q000627:therapeutic use
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D009287:Naphthyridines; D002939:Ciprofloxacin; C080163:trovafloxacin; C061363:sparfloxacin