A rapid and sensitive method for simultaneous determination of vincristine and verapamil in rat plasma was first developed and validated, using high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) in multiple reaction monitoring (MRM) mode via electrospray ionization (ESI). The method, which required a small sample volume (25 µL) of plasma, was linear in the concentration range of 0.5-500 ng/mL for vincristine and 0.1-100.0 ng/mL for verapamil. Finally, the method was successfully employed in a pharmacokinetic study of vincristine and verapamil in rats after an oral administration of a dual-agent formulation containing vincristine and verapamil.
Copyright © 2010 John Wiley & Sons, Ltd.