About seven to ten percent of the people of our society are suffering from anxiety, depression, stress, irritability etc because of leading a hectic life and decline in social activities, ultimately affect the behavior and cause psychiatric disorders which at least in part results from disorder of social behavior summary.Behavioral pharmacology is relatively new discipline and is still advancing rapidly. The new drugs with new applications are constantly appearing and the information which is valid today may be invalid tomorrow. Nevertheless, it is hoped that the information indebted in this book will stand the test of time, although inevitably, some material will need to be revised. This book provides valuable information of various psychoactive drugs on social and solitary behavior of rhesus monkey which is primarily useful for the students of pharmacology, pharmacy, neurosciences and other biological disciplines. It is hoped that it may also be found valuable to those working in related discipline such as psychiatry, those working for higher pre-clinical qualifications in related area and also to the interested layman.