This book presents an overview of the rapidly developing field of nanotechnology applications in drug delivery systems and covers a variety of technologies and materials that help in achieving vast variation in the particle size needed in technology and drug delivery-based research. It discusses nanotechnology's use in healthcare for the development of target-specific drug therapy and smart field systems and in the pharmaceutical industry to improve the quality, efficacy, and shelf life of medicines. Bringing together principles, theory, practice, and applications of nanotechnology, the book is a useful resource for chemists, physicists, biomedical researchers, engineers, advanced undergraduate and graduate-level students in nanotechnology, researchers in pharmaceutical sciences, chemistry, biology, biotechnology engineering, and general readers in nanotechnology.