DOIAbstract
Gastroretentive drug delivery system retains the dosage form for a long span. In this review, we have summarized about factorsaffecting gastric retention and effervescent and non-effervescent drug delivery systems with the diagram in detail. It alsoincludes in vitro evaluation techniques to evaluate the performance of gastroretentive systems. Marketed formulations regardinggastroretentive drug delivery systems are summarized. Detail about mucoadhesive formulations and their role in gastroretentionis also discussed in this review. This review gives a full view on gastroretentive systems.Key words: ,,, 
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