Pharmacology has become a very prominent field of study in the recent decades. It plays a crucial role in the development of therapeutic medicines and novel drugs that can be used for treatment of critical illnesses. The chapters included in this book provide significant information on the mechanism of drug action, methods of synthesis, adverse chemical reactions, evaluation of different drugs and chemical compounds, etc. Researches and case studies compiled herein aim to provide an overview of the latest advancements in this field. The important concepts that are discussed in the book will benefit students, researchers and professionals engaged in this field at various levels.