In this article the polymers which are used in drug delivery are mentioned polymers are mainly natural and synthetic in nature. These have the property to entrap the bioactive agents because of its matrix formation property, which able to reaches the drug towards targeted sites in optimum amounts. Polymers are applicable in targeted drug delivery and also act rate controlling material in pharmaceutical formulation. Selection of polymer in formulation depends upon the bulk and surface properties of polymer like molecular weight, adhesion, solubility, hydro-philicity, lubricity, surface energy and smoothness.
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