Abstract
Cilnidipine is one of the dihydropyridine calcium antagonists. It was created combinedly by Fuji Viscera Pharmaceutical Company, Ajinomoto and Japan and was approved in the year 1995. Cilnidipine acts on N-type calcium channel where exist the end of sympathetic nerve in addition to common L-type calcium channel like that of other calcium antagonists. China, Japan, India, Korea and several other countries approved this drug. The objective of the method validation is to demonstrate whether the method was suited for the intended purpose. The method was validated as per the ICH guidelines. The method was validated for linearity, precision (repeatability, intermediate precision), accuracy, specificity, robustness, limit of detection and limit of quantification. Cosmosil (4.6 X 250mm, 5 μ) column was used for separation. The selected wavelength for Cilnidipine was 241 nm. The mobile phase consists Methanol: Potassium dihydrogen phosphate buffer (50:50). Flow rate was delivered at 1.0 mL/min. Appropriate dilutions of standard stock solutions were prepared as per the get desired concentrations in the range of 100-500 mcg/ml. The RT obtained was 4.8165 minutes.
 Keywords: Cilnidipine, UV spectroscopy, RP-HPLC, ICH
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