Effects of fluconazole and fluvoxamine on the pharmacokinetics and pharmacodynamics of glimepiride

Clinical Pharmacology and Therapeutics
M NiemiK T Kivistö

Abstract

Our objective was to study the effects of fluconazole and fluvoxamine on the pharmacokinetics and pharmacodynamics of glimepiride, a new sulfonylurea antidiabetic drug. In this randomized, double-blind, three-phase crossover study, 12 healthy volunteers took 200 mg of fluconazole once daily (400 mg on day 1), 100 mg of fluvoxamine once daily, or placebo once daily for 4 days. On day 4, a single oral dose of 0.5 mg of glimepiride was administered. Plasma glimepiride and blood glucose concentrations were measured up to 12 hours. In the fluconazole phase, the mean total area under the plasma concentration-time curve of glimepiride was 238% (P <.0001) and the peak plasma concentration was 151% (P <.0001) of the respective control value. The mean elimination half-life of glimepiride was prolonged from 2.0 to 3.3 hours (P <.0001) by fluconazole. In the fluvoxamine phase, the mean area under the plasma concentration-time curve of glimepiride was not significantly different from that in the placebo phase. However, the mean peak plasma concentration of glimepiride was 143% (P <.05) of the control and the elimination half-life was prolonged from 2.0 to 2.3 hours (P <.01) by fluvoxamine. Fluconazole and fluvoxamine did not cause statistic...Continue Reading

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