A Comparative Study of the Fluoroquinolone Antibacterial Agents on the Action Potential Duration in Guinea Pig Ventricular Myocardia

Jpn J Pharmacol. 2001 Nov;87(3):231-4. doi: 10.1254/jjp.87.231.


We examined the effects of ten fluoroquinolone antibacterial agents, levofloxacin, sitafloxacin, trovafloxacin, ciprofloxacin, gemifloxacin, tosufloxacin, gatifloxacin, grepafloxacin, moxifloxacin and sparfloxacin, on action potentials recorded from guinea pig ventricular myocardia. Sparfloxacin prolonged action potential duration (APD) by about 8% at 10 microM and 41% at 100 microM. Gatifloxacin, grepafloxacin and moxifloxacin also prolonged APD at 100 microM by about 13%, 24% and 25%, respectively. In contrast, levofloxacin, sitafloxacin, trovafloxacin, ciprofloxacin, gemifloxacin and tosufloxacin had little or no APD-prolonging effect at concentrations as high as 100 microM. These findings suggest that there are differences in potency to prolong QT interval among the fluoroquinolones.

Publication types

  • Comparative Study

MeSH terms

  • Action Potentials / drug effects
  • Animals
  • Anti-Infective Agents / blood
  • Anti-Infective Agents / pharmacology*
  • Fluoroquinolones
  • Guinea Pigs
  • Heart / drug effects*
  • Heart / physiology
  • In Vitro Techniques
  • Male
  • Time Factors


  • Anti-Infective Agents
  • Fluoroquinolones