DEVELOPMENT AND CHARACTERIZATION OF GASTRO-RETENTIVE SOLID DOSAGE FORM OF ANTI-HYPERTENSIVE DRUG

Sana Roohi*, J. Samatha, S. Hymavathi, MD. Muzaffar-Ur-Rehman and Akhila Alladi

ABSTRACT

In the present research work gastro retentive floating matrix formulation of Captopril by using various hydrophilic polymers were developed. Initially analytical method development was done for the drug molecule. Absorption maximum was determined based on which calibration curve was developed by using different concentrations. Gas generating agent sodium bicarbonate concentration was optimized. Then the formulation was developed by using different concentrations of polymers of various grades of Methocel and Guar gum as polymeric substances. The formulation blend was subjected to various preformulation studies, flow properties and all the formulations were found to be good indicating that the powder blend has good flow properties. Among all the formulations, the formulations of Methocel K15M as polymer were retarded the drug release up to desired time period of 12 hours in the concentration of 180 mg (F3 Formulation, 98.66% Drug release), whereas in low concentrations the polymer was unable to produce the desired action. The formulations prepared with Methocel K100M were also retarded the drug release for more than 12 hours. Hence they were not considered. From the FT-IR spectrum, it was revealed that there was no drug-excipient incompatibility. The optimized formulation dissolution data was subjected to release kinetics, from which it was evident that the formulation followed zero order mechanism of drug release.

Keywords: Captopril, Guar gum, HPMC polymers, Floating tablets.