Shaikh Siraj

The objective of this research work was to formulate and evaluate the floating drug delivery system containing Risperidone drug, to improve oral bioavailability by increasing gastric residence time. Gastroretentive drug delivery system was developed by using Gum karaya & HPMC K 200M polymers. Formulations were prepared by using direct compression method. Optimization study was performed by using 32  full factorial design. The formulated floating tablets batches were evaluated for physicochemical parameters like hardness, thickness, weight variation, friability, drug content, floating lag time and swelling index. All prepared batches shown good in-vitro buoyancy studies and acceptable result of  for various parameters. Comparing the all the formulations, formulation R6 was considered as optimized formulation which exhibited 99.41% of drug release in 12 hours, floating lag time of 2.14 ± 2.0 minutes total floating time of over 12 hours.

Gastro retentive drug delivery system is benefited system in which dosage form retained in stomach prolong period of time and drug release long period of time. Floating system means that float over the surface of the gastric contents when the stomach is full but at the time stomach is empties and the tablet reaches the pylorus the buoyancy of the dosage may be decrease & bioadhesive system becomes dislodged from the stomach wall when the system is full but a floating -bioadhesive system would overcome these drawback of floating and bioadhesive system and improving the therapeutic effect of the drug involved.   So this Floating-bioadhesive dosage forms exhibit a unique combination of floatation and adhesion for prolonged residence in the Stomach. Currently this floating bioadhesive approach is not only used for tablets but also for microsphere, beads & other dosage forms. This review article focus on recently used combination approaches to deliver drug by gastrointestinal drug delivery like Bioadhesive and floating.