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Controlled-release systems also offer a sustained-release profile but, in contrast to sustained-release forms, controlled-release systems are designed to lead to predictably constant plasma concentrations, independently of the biological environment of the application site. This means that they are actually controlling the drug concentration in the body, not just the release of the drug from the dosage form, as is the case in a sustained-release system. The main objective of this formulation development was to design an osmotic drug delivery system acting as a controlled release drug delivery system. In this formulation osmogen and release retardant were used to obtain suitable formulation. In the present study, attempts were made to formulate and evaluate API in extended release dosage form using osmotic drug delivery.
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