Osmotically Controlled Oral Drug Delivery Systems ├ó┬?┬? A Review
Ghanshyam Umaretiya*, Dr. J. R. Chavda*, Dr. J. K. Patel**
Osmotic drug delivery systems are new approach for a modified release dosage form. Various innovations and patents available for various types of osmotic drug delivery system. The review is concerned with the drug release study of tablets coated with walls of controlled porosity. Drugs can be delivered in a controlled pattern over a long period of time by osmotic process. These devices are the most promising strategy and most reliable controlled drug delivery system as oral drug delivery systems. In this paper, mechanism of osmosis, principle of osmosis, factors affecting drug release, types of pumps and materials used, evaluation, various types of osmotic drug delivery systems and the basic components have been discussed briefly.
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