Neuropsychopharmacology is the interdisciplinary science which overlaps psychopharmacology and neuroscience. It attempts to develop and understanding about the impact of drugs on neural mechanism that influence behavior. It encompasses the research of mechanisms of neuropathology, pharmacodynamics, psychiatric illnesses, and states of consciousness. Studies comprising neurotransmission/receptor activity, bio-chemical processes, and neural circuitry are also conducted within this field. The clinical aspect of this field encompasses psychiatric as well as neurologic pharmacology-based treatments. This book traces the progress of this field and highlights some of its key concepts. Research in this field has an impact on the study of various disorders such as anxiety disorders, affective disorder, psychotic disorder, etc. It is a valuable compilation of topics, ranging from the basic to the most complex advancements in this field. This book will help the readers in keeping pace with the rapid changes in the field of neuropsychopharmacology.