Abstract
A new high-performance liquid chromatographic (HPLC) assay was developed for the determination of nimodipine in monkey plasma. An ethyl acetate extraction procedure was employed with a reversed-phase HPLC separation for the analysis. Absolute recovery of nimodipine from plasma was over 95% with a lower limit of quantitation of 10 ng/ml. This method was applied to a preliminary pharmacokinetic study in which 0.25 mg/kg nimodipine was administered intravenously to three monkeys. Protein binding and stability of nimodipine in monkey plasma were also examined. The pharmacokinetic parameters of nimodipine in monkeys were similar to those obtained in humans and indicate that monkeys are an appropriate animal model for further pharmacokinetic investigations.
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