This book is an introduction to toxicology and is designed primarily for Post graduate students and Research scholars. Now days the whole world is facing a pandemic of the most dreaded human disease caused by toxicants. Therefore study of toxicology serves society in many ways, not only to protect humans and the environment from the deleterious effects of toxicants but also to facilitate the development of more selective toxicants such as anticancer and other clinical drugs and pesticides. In chapters covering rapidly expanding matter, the usually required material has been presented in a fairly concise form, and then details on special aspects have been given in the form of addenda. It is hoped that this approach will meet the needs of Post graduate students, Research scholars and provide sources for more advanced study. Efforts have been made to include the latest available information in some chapters to make the book upto-date.

The constructive suggestion from the conscious readers is always cordially invited for further improvement of the book. The study of toxic action from the use of biochemical and molecular techniques can be expected. No doubt new techniques will be developed, answers will be found to many questions that did not yield to earlier techniques and new questions will be raised. The challenge, as always, will be to integrate the results from these studies—and reach new levels of sophistication—into useful and productive approaches to reduce chemical effects on human health and the environment.