Pharmacology is the branch of biomedical science that deals with the discovery, research and characterization of chemicals that show biological effects. It is concerned with the explanation of cellular and organismal functions in relation to these chemicals. It examines the interactions that occur between a living organism and chemicals that affect both normal and abnormal biochemical functions. It also includes drug composition, synthesis and drug design, cellular communication, molecular diagnostic, therapy, chemical biology and medical applications and antipathogenic capabilities. There are two main branches of pharmacology - pharmacodynamics and pharmacokinetics. Pharmacodynamics studies the chemicals with biological receptors and pharmacokinetics studies absorption, distribution, metabolism and excretion of chemicals from the biological systems. This book presents researches and studies performed by experts across the globe. It will also provide interesting topics for research which interested readers can take up. Students, researchers, experts and all associated with pharmaceutical science will benefit alike from this book.