A colorimetric assay procedure was developed for the quantitativ analysis of dihydralazine sulfate. The method is based-on the interaction of 2,3,5-triphenyltetrazolium chloride with dihydralazine sulfate, in presence of potassium hydroxide in absolute ethanol, to afford a highly colored and stable formazan. This could be spectrophotometrically quantified at 485 nm, with an ideal adherence to Beer's law for solutions containing 2.0-22.0 mcg dihydralazine sulfate/ml. The presented color reaction is selective; no interference could be displayed by reserpine or hydrochlorothiazide. This permitted the application of the procedure to the satisfactory analysis of commercial dihydralazine formulations without prior separation from these drugs.
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