Biodegradable polymeric drag delivery

Since the dissolution of polymeric materials is the key to this mechanism, the polymers used must be water-soluble and/or degradable in water. The choice of a particular polymer for a particular controlled release dosage form depends on various factors such as the dissolution mechanism, delivery period, delivery route, the drag etc. In general, synthetic water-soluble polymers tend to be widely used for oral-controlled release dosage forms. Biodegradable polymers tend to be used for injectable, or implantable, drag delivery systems. 

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