Transdermal Drug Delivery System: An Overview

From the past three decades there are huge changes and developments in formulation technology. Innovations in drug delivery systems are not only associated with the development of novel dosage forms but also with the development of new formulations using existing drugs for the treatment. These innovations in delivery of drug have many advantages like better patient compliance, maintenance of steady state concentration of drug for the prolong period, reducing dosing frequency, drug targeting to desired site of action and low side effects. TDDS are designed for delivery of drugs across the skin and it provides both controlled and continuous administration drug. It terminates the pulsed entry of drug in systemic circulation due to which side effects are observed. This transdermal route of drug delivery has more benefits and convenience than oral route and enhances the safety and efficacy of drug; it is patient friendly and painless device that provides regulated, uniform administration and the continuous supply of drug to targeted site for treatment of various diseases.