The advent of new era of pharmaceutical dosage forms, transdermal drug delivery system (TDDS) established itself as an integral part of novel drug delivery systems. Transdermal patches are polymeric formulations which when applied on skin delivers the drug at a predetermined rate across dermis to achieve systemic effects. However Transdermal dosage forms are costly alternatives to conventional dosage forms. Now days these are becoming popular because of their unique advantages such as Controlled absorption, uniform plasma levels, improved bioavailability, reduced side effects, painless and simple application and flexibility of terminating drug administration by simply removing the patch from the skin.
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