This book has been written strictly in accordance with the syllabus of Pharmacotherapeutics - Theory given in the ER-2020 for D.Pharm. Utmost care has been taken to present the up to date information about the diseases and disorders covered under the syllabus to the students. While preparing the contents of the book we followed latest guidelines from Ministry of Health and Family Welfare, Govt. of India; WHO; National TB Elimination Program (NTEP); National AIDS Control Organisation (NACO); Diabetes ICMR guidelines; National Vector Borne Disease Control Programme (NVBDCP); National Institute of Malaria Research (NIMR); The National Guidelines for Control of Iron Deficiency Anaemia; The American Psychiatric Association Practice Guideline for the Treatment of Patients with Schizophrenia; Mental Health First Aid International Psychosis Guidelines, Australia; Standard Treatment Protocol, Public Health Department Govt. of Maharashtra; Standard Treatment Guidelines, Government of Gujarat; Standard Treatment Guidelines (2016), Madhya Pradesh; Pharmacotherapy: A Pathophysiologic Approach, Joseph T. DiPiro, et al. It is hoped that the book will be received favourably as an effective textbook by both students and teachers of the subject.