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Objective: A new simple and precise stability-indicating bioanalytical reverse-phase high-performance liquid
chromatography (RP-HPLC) method was developed and validated for the simultaneous estimation of prazosin
and polythiazide in their formulation and in human plasma. Materials and Methods: The developed method was
successfully used for assaying drug contents in plasma. Isocratic elution mode was carried at Agilent C18 column
(150 mm Ã— 4.6 mm, 5 Î¼m particle size) using 0.01 N disodium hydrogen phosphate pH 5.0:acetonitrile (55:45) as
mobile phase at flow rate 1.0 ml min at detection wavelength 265 nm. Celecoxib was taken as an internal standard.
The method was validated as per ICH guidelines. Results and Discussion: The present validated method can be
successfully applied for the estimation of prazosin and polythiazide in human plasma over the concentration range
of 12.5â€“500 ng/m of prazosin and 6.25â€“250 ng/ml of polythiazide. The method for the determination of prazosin
and polythiazide in human plasma using HPLC detection met the acceptance criteria with respect to selectivity,
precision, accuracy, linearity, and recovery. Conclusion: The proposed method is simple, rapid, accurate, precise,
and appropriate for pharmacokinetic and therapeutic drug monitoring in the clinical laboratories.
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