Kinetics of R and S warfarin enantiomers

Abstract
A method is reported for simultaneous measurement of the kinetics of R and S warfarin enantiomers [anticoagulant]. Pure pentadeuterated R and S enantiomers were each combined with unlabeled enantiomers to form pseudo -racemic mixtures which were given (0.75 mg/kg) to 5 healthy subjects. Plasma R and S enantiomer levels were measured by gas chromatography-mass spectrometry. Elimination half-lifes (t 1/2) and volumes of distribution (Vd) of the enantiomers were not altered by the presence of the other.