Formulation and evaluation of sustained release matrix tablet of metoprolol succinate by using xanthan gum and carbopol

Metoprolol succinate is a β1 selective antagonist used as an Anti-hypertensive, Anti arrhythmic, Anti Angina. The aim of present investigation was to develop matrix tablets of Metoprolol succinate using different polymers.Metoprolol succinate matrix tablet was prepared by use of xanthan gum and carbopol-934 as a polymer initially by direct compression methods. Physicochemical compatibility of the drug with polymer was confirmed by IR spectroscopy and DSC. Metoprolol succinate matrix tablets were prepared by direct compression and wet granulation method using different polymers. All the formulations were evaluated for weight variation, thickness, hardness, friability and dissolution. The result of matrix tablets formulation (A-4) showed drug release 94.12% in 720 min. Therefore it was concluded that formulation (A-4) containing carbopol-934 and xanthan gum in the ratio of 80:20 showing promising result for sustained release of Metoprolol succinate, further for improvement of release profile in situ interpolymeric complexes of both carbopol and xanthan gum were tried. All the formulations were evaluated for weight variation, thickness, hardness, friability and dissolution. The results of IPC formulation B-11 showed drug release 96.29% in 720 min. It was concluded that tablets were prepared by using in-situ inter polymer complex formed with 70:30 ratio of Carbopol and Xanthan gum solution as binder. Formulation B-11 showed promising result because of its resistance in pH 1.2 HCL buffer for more than 2 hrs showed the maximum sustained release as compared to simple matrix tablet because of more acid resistance of the complex. Thus, sustained release matrix tablets of Metoprolol succinate using biocompatible polymers were successfully formulated, evaluated and found to be suitable candidates in extending the release of the drug from the matrix tablets. Keywords: Metoprolol succinate, Sustained release Matrix tablets, Direct compression, Wet granulation method.&nbsp