DESIGN AND DEVELOPMENT OF MODIFIED RELEASE TABLET BY MIXED SOLVENCY ASSISTED SOLID DISPERSION OF VALSARTAN

In the present investigation, newly developed solid dispersion technology that precludes the use of organic solvent and decreases the individual concentration of hydrotropic agents, simultaneously decreasing their toxic potential, was employed for preparing dispersions of valsartan. Valsartan is a pro-drug which has poor bioavailability because of poor solubility as it belongs to BCS class II. Study aims to enhance the solubility of valsartan by mixed solvency approach. Solution was made by using different co-solvents to enhance the solubility of valsartan. Camphor, thymol were used as solvents to increase the solubility of valsartan. A mixture of camphor: thymol (1:1) was selected for solubility enhancement of valsartan. FTIR study did not show any interaction between drug and excipients. Prepared solid dispersions were evaluated for flow properties, XRD, DSC, and SEM were also compressed to form tablets. Dissolution studies of prepared tablets were carried out using USP Type II Apparatus. The stability study for up to one month showed no significant changes by evaluation parameter. It was concluded that the concept of mixed solvency solid dispersion is novel, safe and cost-effective technique for enhancing the bioavailability of poorly water soluble drugs by dissolving drug in non-ionized form.