Pharmacology is the branch of medicine concerned with the uses, effects, and modes of action of drugs.A drug can be broadly defined as any man-made, natural, or endogenous (from within body) moleculewhich exerts a biochemical or physiological effect on the cell, tissue, organ, or organism. In this bookthere is thorough coverage of drug actions and reactions. This book covers the basic principles ofpharmacological interactions on the human body in a way that is useful for both undergraduate andgraduate students. The topics of this book include sites and mechanisms of drug actions and travel tosites of action, as well as termination and elimination. The book also includes drug response and timeresponse relationships, response variability, drug toxicity, drug abuse, drug dependence, and more.Thisbook is comprehensive in nature and includes emerging topics and the latest research advances. Thisbook will prove a valuable reference for practitioners, specialists, consultants and students. Scientistsand students of this field in general will find this book valuable.