Book excerpt: Novel Psychoactive Substances: Classification, Pharmacology and Toxicology, Second Edition provides readers with a comprehensive examination on the classification, detection, supply and availability of novel psychoactive substances, otherwise known as "legal highs." The book covers individual classes of novel psychoactive substances that have recently emerged onto the recreational drug scene and provides an overview of the pharmacology of the substance and a discussion of their associated acute and chronic harm and toxicity. This second edition addresses drugs new to the scene, with completely updated and revised chapters. Written by international experts in the field, this multi-authored book is an essential reference for scientists, clinicians, academics, and regulatory and law enforcement professionals. - Includes chapters written by international experts in the field - Presents a comprehensive overview on the classification, detection, availability and supply of novel psychoactive substances, in addition to the pharmacology and toxicology associated with the substance - Offers a single source for all interested parties working in this area, including scientists, academics, clinicians, law enforcement and regulatory agencies - Provides a full treatment of novel psychoactive substances that have recently emerged onto the recreational drug scene, including amphetamines and the synthetic cannabinoid receptors in 'spice' and 'K2'