Rp-Hplc Method for Estimation of Metoprolol Succinate and Olmesartan Medoxomil in Pharmaceutical Formulation with forced Degradation Studies

A simple, specific, accurate, and precise RP-HPLC method was developed and validated for the simultaneous estimation of Metoprolol Succinate and Olmesartan Medoxomil in pharmaceutical formulation with forced degradation studies. The method was developed using Enable C 18G column (250 ×4.6 mm, 5 µm) with mobile phase consisting of methanol and water (pH adjusted to 3.5 with orthophosphoric acid in the ratio of 80: 20 % v/v with a flow rate of 1 mL/min. The UV detection was carried out at 240 nm. The retention time for Metoprolol Succinate and Olmesartan Medoxomil were found to be 3.986 and 6.092 min, respectively. The proposed method was validated for linearity, range, accuracy, precision, robustness, LOD, and LOQ. Linearity was observed over a concentration range 4-40 µg/mL for Metoprolol Succinate (r2 = 0.9999) and 5-60 µg/ml for Olmesartan Medoxomil (r2 = 0.9999). The % RSD for Intraday and Interday precision was found to be 0.57 and 0.68 for Metoprolol Succinate and 0.52 and 0.41 for Olmesartan Medoxomil. The LOD and LOQ were found to be 0.1143 µg/mL and 0.3565 µg/mL for Metoprolol Succinate and LOD and LOQ were found to be 0.0563 and 0.1782 µg/mL for Olmesartan Medoxomil respectively.