Immunotoxicology is the design and development of drugs that reduce the function of the immune system. Immunotoxic medication and treatment are known as anti-rejection drugs for the role they play in transplantation and radiation treatment. The text elucidates the concepts and innovative models around prospective developments with respect to this field. Immunotoxicology is an upcoming field of science that has undergone rapid development over the past few decades. This text aims to shed light on some of the unexplored aspects and the recent researches in this field. In this book, understanding of the difficult concepts of immunotoxicology as easy and informative as possible, for the readers.