Textbook of Drug Acting on Body Systems and Diseases is essential for clinical research professionals, UG-PG students, and researchers. This book provides an introduction to the anatomy and physiology of all human body systems along with basic knowledge of the drug action on various body systems and related diseases. Authors mentioned all relevant information in very simple, lucid, and scientific methods. This textbook has been designed as per the academic curriculum of post graduate students of clinical research and is a very informative manual for clinical research professionals.