"This is a novel foray into the realm of reviews on non-poppy-derived opioids and their pharmacology and … provides very solid information about the chemistry of the mitragynines…The editor, Robert Raffa, is a widely known expert in the pharmacology of opioid drugs with significant knowledge and respect in the field."—Kenneth E. McCarson, BChE, PhD, University of Kansas Medical Center for Doody's Review Service"This book should be an indispensable single-volume information source for anyone working in the fields of opioid chemistry, pharmacology and toxicology. Some chapters would be of particular interest to … specialists working in addiction treatment and drug regulation. The book would also be an excellent addition to any library collection specialized in natural products or drugs of abuse."—Journal of Addition Research and Therapy