This book introduces transdermal drug delivery and the developments that have taken place in various transdermal drug delivery techniques including the system-level design approach of a novel miniaturized medical device to offer precise and painless drug delivery via a skin-based transdermal route. It discusses the microelectromechanical systems (MEMS)-based fabrication technique and the design, fabrication and characterization of different MEMS-based components like microneedles and micropumps. It further includes a MEMS-based component micropump with design, analysis, fabrication and characterization of the transdermal drug delivery device and challenges encountered in the design improvements. Features: The book is aimed at researchers, professionals, and graduate students in biomedical engineering, microelectronics, micro-electro-mechanical-systems, and drug delivery.