Formulation and Evaluation of Nateglinide Sustained Release Tablets

Abstract

The objective of the present investigation was to design suitable sustained release tablet formulation of Nateglinide by using different polymers such as hydroxy propyl methyl cellulose K15M, xanthan gum, guar gum as release rate retarding polymers. The tablets were prepared by direct compression technique. Nateglinide is used as anti diabetic drug. The objective of the treatment is to achieve hypoglycemia, by using an ideal dosage regimen. The sustained release formulation provides extend duration of action in therapeutic range without reaching toxic levels as in the case of conventional dosage forms. The real formulation trails are carried from F1 to F9 in which Drug: Polymer ratio was set as 1:9 respectively. The prepared formulations F1 to F9 were evaluated for pre and post compression characteristics, along with the in vitro dissolution Studies. It was found that the release of drug from F1, F2, and F3 gave the better release than other formulations. In these three formulations F2 showing highest release following first order kinetics. From the Higuchi plot good correlation coefficient was observed showing diffusion mechanism. From the peppas plot it was observed that the release model was non fickian anomalous. The release rate was decreased as polymer concentration increased so it shows that increase in diffusion length of polymer decreases the release rate.