Development and Validation of RP-HPLC Method for the Simultaneous Estimation of Haloperidol and Trihexyphenidyl in API and Combined Tablet Dosage Form

A rapid and precise reverse phase high performance liquid chromatographic method has been developed for the validated of Trihexyphenidyl and Haloperidol, in its pure form as well as in tablet dosage form. Chromatography was carried out on a Altima C18 (4.6 x 150mm, 5μm) column using a mixture of Methanol: TEA Buffer pH 4.5: Acetonitrile (50:25:25) as the mobile phase at a flow rate of 1.0ml/min, the detection was carried out at 225 nm. The retention time of the Trihexyphenidyl and Haloperidol was 2.102, 3.537±0.02min respectively. The method produce linear responses in the concentration range of 15-75ppm of Trihexyphenidyland 37.5-187.5ppm of Haloperidol. The method precision for the determination of assay was below 2.0%RSD. The method is useful in the quality control of pharmaceutical formulations.