New materials are enhancing innovative systems currently under development controlled drug delivery occurs when a polymer whether natural or synthetic is judiciously combined with a drug or other active agent in such a way that the active agent is released from the material in a predesigned manner. Polymers for controlled drug delivery addresses the challenges of designing macromolecules that deliver therapeutic agents that function safely and in concert with living organisms. Smart polymers are becoming increasingly important in the fields of controlled drug delivery biomedical applications and tissue engineering and it is often beneficial to employ polymers that can respond to stimuli which are inherently present in natural systems table 2 summarises the various smart polymeric drug delivery systems table 1. Polymers are becoming very important in the drug delivery field to control the drug release rate from the formulation polymers are being used as the main tool polymers can be used as taste. Polymeric microneedle mn systems are interesting transdermal drug delivery systems because of their controlled drug delivery tunable properties and ease of patient self administration
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