Polyelectrolytes: as a Drug Delivery System
Abstract
The purpose of this paper is to focus on drug delivery system developing by such polyelectrolytes and most focused on targeting of drugs to specific sites have aroused as revolution in pharmaceutical field, thereby, giving rise to drug delivery systems. Polymers have gained much importance in drug delivery especially those which respond in some desired way to change in pH, temperature, electric or magnetic field. For this reason they are very frequently and extensively used as excipients in design and advancement of controlled and/or sustained release products. The scope of polymers used in dosage form design can be increased by several approaches such as modification of their chemical structure, by combining different polymers in physical mixtures or by formation of polymer-polymer associations such as polyelectrolyte complexes.
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