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Abstract

ABSTRACT:Oral drug delivery is the most preferred route for the various drug molecules among all other routes of drug delivery, because ease of administration which lead to better patient compliance. So, oral extended release drug delivery system becomes a very promising approach for those drugs that are given orally but having the shorter halflife and high dosing frequency. Extended release drug delivery system which reduce the dosing frequency of certain drugs by releasing the drug slowly over an extended period of time. Oral sustained drug delivery system is complicated by limited gastric residence times (GRTs). To overcome these limitations, various approaches have been proposed to increase gastric residence of drug delivery systems in the upper part of the gastrointestinal tract. The purpose of writing this review was to compile recent literature on pharmaceutical approaches used in enhancing the Gastric Residence Time (GRT). Enhancing the GRT may explore new potentials of stomach as drug-absorbing organ. Several approaches are currently used including Floating drug delivery system, Matrix tablet, pulsatile drug delivery, In situ gel, Stomach specific Mucoadhesive tablets and Microsponge.