The development of improved methods of drug delivery has received significant attention over the last two decades. Most important is a non-toxic level of the drug at a particular body organ or body locale. To reach this goal, many variations of controlled release have been researched worldwide. This edited volume of papers from the Journal of Biomaterials Applications details many exciting technical advances in controlled release drug delivery systems. Some of the important developments described in the book include implantable delivery systems, delivery of topical drugs, and ultrasonic drug delivery.