About Authors: 1Arun Kumar Dash*, 2Amitesh Palo,
1. Royal College of Pharmacy and Health Sciences, Berhampur.
2. College of Pharmaceutical Sciences, Mohuda, Berhampur
A simple method for the estimation of Olmesartan in bulk and pharmaceutical dosage forms has been developed. Methanol was chosen as the solvent system. The λmax was found to be 257nm and all absorbance values were carried out at 257nm. The responses were linear in the range of 5-35µg/ml. The regression equation of the calibration graph and correlation coefficient were found to be y = 0.049x + 0.007 and 0.999 respectively. The %RSD values for both intraday and interday precision were less than 1%. The recovery of the drug from the sample was ranged between 99.36 and 100.49%. The proposed method was validated for precision, accuracy, intraday, interday assay, robustness and ruggedness. Commercial tablets containing 20mg and 40mg of Olmesartan were analyzed by the proposed method and the results were well within the claimed limits. Furthermore stability studies of Olmesartan were carried out under acidic, alkaline, hydrolytic and photolytic conditions as per SIAM (Stability Indicating Assay Methods).