Over the last 10 years there have been many changes in the development, control, and regulation of transdermal and topical products. Various quality issues have been reported by patients and practitioners resulting in the recall or removal of products from the market. With chapters written by experts in this field, this book takes a 21st century multidisciplinary and cross-functional look at these dosage forms to improve the development, design, manufacturing, quality, clinical performance, safety, and regulation of these products.