Novel approaches of gastro retentive drug delivery system

Oral route of drug administration is the most convenient route and accepted route of drug delivery. It is probable that at least 90% of all the drugs given by oral route. There are different drug deliveries to cure the diseases through oral route. Among them Gastroretentive drug delivery system plays an important and significant role in novel drug delivery systems. The floating systems, bioadhesive drug delivery system, expandable drug delivery system, high density systems, effervescent systems (Gas Generating systems), non-effervescent systems etc are various approaches. The wide applications can be achieved through this delivery system are enhanced bioavailability, sustained drug delivery, site-specific drug delivery, absorption enhancement, mitigating adversity at colon etc. In addition to specified above, the advantages and disadvantages, drugs and polymers used and the method of evaluation is also summarized in this review.