Pharmacology is a medical science that forms a backbone of the medical profession as drugs form the corner stone of therapy in human diseases. Therefore, it is of utmost importance to describe the pharmacological basis of therapeutics in order to maximize the benefits and minimize the risks of drugs to recipients. The goal is to empower the practitioner through an understanding of the fundamental scientific principles of pharmacology. At the same time, Pharmacology is the ground of the pharmacotherapy in all branches of the clinical medicine. The most important objective of medical pharmacology is to train medical students in therapeutic decision making according to specific clinical problems in individual patients. The knowledge about drugs, their mechanisms of action and usage is necessary for every doctor regardless the speciality. This book will not only help the students have a better grasp of the subject but also lay a strong foundation for the integration of pharmacological aspects with clinical subjects.