Transdermal drug delivery systems, sometimes referred to as "patches," have significantly improved patient outcomes by offering the benefit of a relatively painless method of administering medication through the skin to provide a systemic effect. Benefits of these patches include regulated medication release, convenience of usage, and avoiding first-pass metabolism. Transdermal drug delivery system was presented to overcome the difficulties of drug delivery especially oral route. A transdermal patch is a medicated adhesive patch that is placed on the skin to deliver a specific dose of medication through the skin and into the bloodstream. It promotes healing to an injured area of the body.The review gives valuable information about the transdermal patch like its advantage, disadvantage, types of transdermal patch, factors basic components, methods, evaluation, technologies and marketed products
