Colon targeted micro capsules of Tinidazole were prepared by using Guar gum as the drug targeting polymer. The emulsion polymerization technique for preparation of the micro capsules was optimized using full factorial DOE. It was identified that the HLB value of the surfactant mixture was critical for maximizing entrapment efficiency. The in vitro drug release studies in pH 1.2, pH 4.5, pH 6.8 and pH 7.2 buffers indicated no significant drug release at any of these media. However, in pH 6.8 and pH 7.2 buffer enriched with Alpha galactosidase and Galactomannase enzymes, the drug release is...

Compression coating provides an unique platform for formulating modified release products in a way the dosage form can successfully be targeted to localize the release of the drug in any desired portion of the GIT without the additional step of film coating. The current work focuses on the development and optimization of modified release Tramadol Hydrochloride tablets using this platform. The innovator product (Ultram ER) is a reservoir based functional film coated tablet system. The disadvantages of this system are that the coating is solvent based and the % weight gain required is in the...