Abstract

The design of controlled drug delivery systems (DDS) should be primarily subjected to aim and to achieve more predictable and increased bioavailability. In-situ gel refers to polymer solution which can be administered as liquid & undergoes a phase transition to semisolid gel upon exposure to physiological environment. The oral gastro-retentive in-situ gel forming polymeric drug delivery systems are designed with an objective to retain in stomach for an extended time period and also for achieving systemic drug effects over than other pharmaceutical dosage forms. The formulation is introduced to overcome the rapidly increasing cost and to reduce the time required in the development works over than the other pharmaceutical dosage forms. Many natural, biodegradable, biocompatible and synthetic polymers like alginic acid, pluronic F127, xyloglucan, gellan gum, carbopol, pectin, chitosan, poly (DL lactic acid), poly (DL-lactide-coglycolide) and poly-caprolactone etc. are used in the preparation of in situ gelling system. The present study was based on the development of stomach specific drug delivery systems using various approaches like gastro-retentive oral in-situ gel formulation. [1, 2]