한국임상약학회지 (Korean Journal of Clinical Pharmacy)

  • 제23권3호
  • /
  • Pages.206-212
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  • 2013
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  • 1226-6051(pISSN)
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  • 2508-786X(eISSN)
한국임상약학회 (Korean College Of Clinical Pharmacy)
권호 표지

와파린의 약물동태학에 니모디핀의 영향

Effects of Nimodipine on the Pharmacokinetics of Warfarin in Rats: A Possible Role of P-glycoprotein and CYP3A4 Inhibition by Nimodipine

  • 투고 : 2013.08.01
  • 심사 : 2013.09.06
  • 발행 : 2013.09.30
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초록

Purpose: The aim of this study was to investigate the effect of nimodipine on the pharmacokinetics of warfarin after oral and intravenous administration of warfarin in rats. Methods: Warfarin was administered orally (0.2 mg/kg) or intravenously (0.05 mg/kg) without or with oral administration of nimodipine (0.5 or 2 mg/kg) in rats. The effect of nimodipine on the P-glycoprotein as well as cytochrome P450 (CYP) 3A4 activity was also evaluated. Results: Nimodipine inhibited CYP3A4 enzyme activity with 50% inhibition concentration ($IC_{50}$) of $10.2{\mu}M$. Compared to those animals in the oral control group (warfarin without nimodipine), the area under the plasma concentration-time curve (AUC) of warfarin was significantly greater (0.5 mg/kg, P<0.05; 2 mg/kg, P<0.01) by 31.3-57.6%, and the peak plasma concentration ($C_{max}$) was significantly higher (2 mg/kg, P<0.05) by 29.4% after oral administration of warfarin with nimodipine, respectively. Consequently, the relative bioavailability of warfarin increased by 1.31- to 1.58-fold and the absolute bioavailability of warfarin with nimodipine was significantly greater by 64.1-76.9% compared to that in the control group (48.7%). In contrast, nimodipine had no effect on any pharmacokinetic parameters of warfarin given intravenously. Conclusion: Therefore, the enhanced oral bioavailability of warfarin may be due to inhibition of CYP 3A4-mediated metabolism rather than P-glycoprotein-mediated efflux by nimodipine.

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