Pharmaceutical invention and research are now increasingly focusing on delivery systems which enhance desirable therapeutic objectives while minimizing side effects. Drug delivery systems, ranging from implantable electronic devices to single polymer chains, are required to be compatible with processes in the body (biocompatibility) as well as with the drug to be delivered. DDS alter the bio-distribution and pharmacokinetics of the associated drug: that is the time-dependent percentage of the administered dose in the different organs of the body. There are various natural and synthetic polymers are used in drug delivery system. The present communication focuses all these aspects with emphasizes of various polymers used in various drug delivery systems.
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