Any substance which causes a temporary physiological or psychological change in the body on being consumed, inhaled, smoked or absorbed is called a drug. Pharmaceutical drugs are the chemical substances which are used to prevent, diagnose, cure or treat diseases or to promote well-being. They can be used for limited period or on regular basis according to the diseases. They are produced from medicinal plants or by organic synthesis. The domain of pharmaceutical science is concerned with the design, delivery, disposition and action of such drugs. The topics included in this book on drugs and pharmaceutical sciences are of utmost significance and bound to provide incredible insights to readers. It strives to provide a fair idea about this discipline and to help develop a better understanding of the latest advances within this field. For all those who are interested in drugs and pharmaceutical sciences, this book can prove to be an essential guide.