Abstract

A simple, rapid, sensitive and selective HPLC method has been developed for the analysis of diazepam (DZP) and its major metabolites, N-desmethyldiazepam (DMDZP), temazepam (TZP) and oxazepam (OZP), in plasma and urine, using clonazepam (CZP) as the internal standard and chloroform as the extracting solvent, with a 10 ng/ml limit of quantitation for the four assayed drugs, and an average (±S.D.) recovery of 87.7±6.46%, 92.9±5.31%, 91.4±4.01% and 91.7±2.68% for DZP, DMDZP, TZP and OZP, respectively (from plasma), and 89.6±2.26%, 90±4.24%, 87.45±0.64% and 94.50±0.71% for DZP, DMDZP, TZP and OZP, respectively (from urine). The method has also proved to be selective and reproducible.

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