In recent era various technologies have been made in research and development of controlled release oral drug delivery system to overcome various physiological difficulties such as variation in gastric retention and emptying time. To overcome this drawback and to maximize the oral absorption of various drugs, novel drug delivery systems have been developed. Gastroretentive drug delivery system is facing many challenges which can be overcome by upcoming emerging approach i.e. low density system. Kollidon SR is an example of low density system which combines the properties like buoyancy through generation of a high porosity in the tablet, binding effect, flow aid, release slowing effect. This review attempt to discuss Kollidon SR properties, formulation and development of floating tablet based on Kollidon SR matrixes, effect of curing on hardness and drug release from Kollidon SR matrixes and various analytical methods for Kollidon SR.
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