The goal of a sustained release dosage form is to maintain therapeutic blood or tissue levels of the drug for an extended and specified period of time. This is generally accomplished by attempting to obtain "zero-order" release from the dosage form. Zero-order release constitutes drug release from the dosage form which is independent of the amount of drug in the delivery system (i.e. a constant release rate). Sustained-release systems generally do not attain this type of release and usually try to mimic zero-order release by providing drug in a slow first-order fashion (i.e., concentration release dependent). Systems that are designated as prolonged release can also be considered as attempts at achieving sustained-release delivery. Based on the in vitro drug released characteristics, entrapment efficiency and t25, t50 and t90 values, the formulation F3 was found to be best formulation. By increasing the concentration of polymer, decreased the rate of drug released. According to stability study it was found that there was no variation in Percentage yield, Entrapment efficiency, and in vitro drug released profile of selected formulation F3 at specified period. The formulation F3 was concluded best formulation among the formulations were prepared
