FORMULATION AND IN-VITRO EVALUATION OF GASTRO RETENTIVE FLOATING TABLET OF VENLAFAXINE HYDROCHLORIDE BY HOT-MELT EXTRUSION METHOD

Drugs that have a proximal absorption window can be improved by the Gastro Retentive Drug Delivery System which provides continuously releasing the drug for a prolonged period of time as controlled delivery before it reaches its absorption site, thus ensuring its optimal bioavailability. The intend of this current work is to formulate a gastro retentive floating tablet of Venlafaxine hydrochloride by hot-melt extrusion method. The buoyancy of tablet leftovers for 24 hours in the stomach and in a controlled way the drug was released. In the present work, by using the direct compression method, various formulations were made, in which HPMC K15M, Guar gum, and Xanthan gum were included as swelling polymers, sodium bicarbonate as gas generating agent, and MCC as diluent, talc, and magnesium stearate used as glidant &lubricant respectively. By the UV spectroscopic and IR spectroscopic interpretation, the characterization of the drug was recognized. The hardness, friability, uniformity of weight, drug-polymer interaction, in-vitro floating studies, Swelling Index & in-vitro drug release studies were evaluated for all the prepared floating formulations. It can be concluded from the results that floating lag time decreased as the concentration of the polymer increased and the percentage drug release was extended. The viscosity of the polymer also showed a directly proportional relationship with the swelling characteristics of the tablets.