Abstract

It is one of the best pharmaceutical dosage forms for those patients, they cannot take medicaments orally. Transdermal drug delivery system (TDDS) established itself as an integral part of novel drug delivery systems (NDDS). On the application of Transdermal patches, the delivery of the drug across dermis gives the systemic effect. TDDS is costly alternative to conventional formulation. It is also important due to its unique advantage. Controlled absorption, more 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 are some of the potential advantages of transdermal drug delivery. Development of controlled release transdermal dosage form is a complex process involving extensive efforts. This review article describes the methods of preparation of different types of transdermal patches. In addition, the various methods of evaluation of transdermal dosage form and Advance Development in TDDS have also been reviewed.