Introduction
Clobazam, 7-chloro-1-methyl-5-phenyl-1, 5-benzodiazepine-2, 4 (3H-dione) (Figure 1), is a benzodiazepine derivative which is used for the treatment of various seizure types and epilepsy [1]. Clobazam belongs to the 1, 5-benzodiazepine class with a pka value of 6.65. Clobazam bulk powder is a white crystal with molecular weight of 300.7. The drug is slightly soluble in water and soluble in alcoholic solvents. A number of HPLC methods have been reported before for the determination of clobazam and its metabolite in human plasma [2-6]. Also, HPLC method has been developed for the determination of clobazam in tablet dosage forms [7]. Clobazam is official in British Pharmacopeia (BP) and The United States Pharmacopeia (USP) and an HPLC method is reported for the assay determination of this drug in capsule dosage forms.