Pharmacology is a branch of medicine concerned with the interaction of drugs with the systems and processes of living animals. It is involved in the mechanisms of drug action along with therapeutic and other uses of drugs. There are two major sub-disciplines of pharmacology, namely, pharmacokinetics and pharmacodynamics. Pharmacokinetics is involved in the study of absorption, distribution, metabolism and excretion of drugs. Pharmacodynamics deals with the study of the molecular, biochemical and physiological effects of drugs, including drug mechanism of action. The field of pharmacology has majorly contributed to the development of knowledge about the cellular receptors with which the drugs interact. The discovery of personalized precision medicine and gene therapy through genomic and proteomic approaches, and application of nano-based technology in prevention against disease are some significant developments in pharmacology. This book consists of contributions made by international experts. It strives to provide a fair idea about this discipline and to help develop a better understanding of the latest advances within the field of pharmacology. The book is appropriate for students seeking detailed information in this area of study as well as for experts.