Development of a UV visible spectrophotometric method for simultaneous estimation of Ranolazine and Metoprolol

Ranolazine being Na+ channel blocker agent, decreases the chances of angina attacks. Metoprolol exerts specific β1 blocking effect which results into decreased cardiac contractility and heart Rate (1). Ultimately reduces oxygen demand of heart. Metoprolol enhances the pharmacological activity of Ranolazine so the combination gives better therapeutic activity (2). There is no UV visible method present for the simultaneous estimation of Ranolazine and Metoprolol. To formulate and evaluate such a formulation involving mentioned drugs this simultaneous equation method was developed using 0.1 N HCl as a solvent. Chosen wavelengths were 272 nm and 242 nm for Ranolazine and Metoprolol Succinate respectively. Linearity range was seen to be 7.5 to 40 ppm for Ranolazine and 1 to 5 ppm for Metoprolol. Recovery studies and Validation were successfully performed according to ICH guidelines. This method can be applied for any formulation consisting mentioned drugs without interference of other excipients.