STUDIES ON CORE IN COAT GASTRORETENTIVE TABLETS USING POROUS CARRIERS WITH CELLULOSIC POLYMERS AND NATURAL GUMS
Putta Rajesh Kumar, Hiremath Doddayya and S. Rajendra Reddy
Department of Pharmaceutics, N.E.T. Pharmacy College, Raichur -584103, Karnataka, India.
Keywords: Floating tablet, porous carrier, xanthan gum, guar gum and duodenal ulcer.
The present study was aimed to develop a gastroretentive tablet that could deliver antibiotic in stomach from the coat tablet for localized action and acid liable anti secretory agent in duodenum from the enteric coated core. During tablet formulation Studies on rheological characteristics of Clarithromycin coat granular blends showed their free flowing nature and ease for compression to tablet. The compressed tablets exhibited uniform post compressional characteristics. Evaluation of floating parameters indicated results suits for the tablets to formulate core in coat tablets for release of Clarithromycin in gastric pH and esomeprazole in alkaline pH to treat peptic ulcer disease associated with h pylori bacteria. The formulations exhibited uniform rheological and post compressional properties. The drug content was found to be uniform and consistent in all formulations. The tablet showed density < 1 facilitated tablets floating ability over 0.1N HCl with minimum floating lag time. In vitro release studies showed that T6C6 formulation exhibited better release for both the drugs in simulated gastric and intestinal fluids for 12 h. The study revealed the role of porous carriers, cellulosic polymers and natural gums on drug release profiles of esomeprazole core in clarithromycin coat gastroretentive tablets in duodenal ulcer treatment.
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