Controlled release technology enhances the beneficial effects of drugs, agrochemicals, and other biologically active agents. This monograph offers background on the terms, concepts, mathematical and chemical principles, and the advantages of, controlled release technology. Treats each of the major techniques of achieving controlled release: diffusion, biodegradation, osmosis, and mechanical systems. Describes and compares the numerous materials used in controlled release devices. Presents techniques for device preparation and evaluation. Describes the most significant commercially available controlled release products.