Abstract

A high-performance liquid chromatographic procedure is presented for the simultaneous determination of reserpine and hydrochlorothiazide in two-component tablet formulations. An aliquot of a tetrahydrofuran extract of the tablet, containing polythiazide as an internal standard, is chromatographed on a microparticulats silica gel column using a mobile phase of 0.01% (v/v) diethylamine, 5% (v/v) chloroform, and 18% (v/v) 2-propanol in n-hexane. The relative standard deviations are 1.2 and 0.6% for the simultaneous determination of reserpine and hydrochlorothiazide, respectively. Seven commercial tablet formulations were found to contain 92.7–101.0% and 98.3–101.4% of the labeled amounts of reserpine and hydrochlorothiazide, respectively.

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