Abstract

A REVIEW ON FLOATING DRUG DELIVERY SYSTEM

Naga Raju Kandukoori*, M. Spruha Shanthi, J. Sushma, Ch. Ramya, M. Swapna, G. Madhu, B. Deepika, KNV Rao and K. Rajeswar Dutt

Abstract

Rate controlled drug delivery systems are developed to overcome physiological adversities like short residence times and unpredictable gastric emptying times. Differences in gastric physiology such as gastric pH and motility exhibit both intra and inter subject variability demonstrating significant impact on gastric residence time and drug delivery behavior. This triggered an increased interest towards formulation of novel delivery systems which retained in the stomach for prolonged and predictable period of time. Several approaches such as floating drug delivery systems (FDDS), swelling and expanding systems, bioadhesive systems, modified shape systems, high density systems or other delayed gastric emptying devices have been discovered till now. FDDS are of particular interest for drugs that are locally active and have narrow absorption window in stomach or upper small intestine, unstable in the intestinal or colonic environment, and exhibit low solubility at high pH values. This review article is in pursuit of giving detailed information on the pharmaceutical basis of their design, classification, advantages and different types of FDDS and the future potential of FDDS.

Keywords: Floating drug delivery systems, Gastric residence time, Swelling index, Buoyancy.