ABSTRACT
Criteria for membership in this group are difficult to define. Hallucinogens are said to share five common features: (1) changes in mood and perception dominate in proportion to any other effects such drugs might exert, (2) minimal memory or intellectual impairment occurs, (3) use is not associated with either stupor or excessive agitation, (4) sideeffects from autonomic nervous system stimulation are minimal, and (5) craving and addiction do not occur (Hollister, 1967). Traditionally, hallucinogens have been divided into two groups: phenylalkylamines (drugs such as mescaline, DOM, DOB) and the indoylalkylamines (psilocybin, bufoteine, LSD, harmaline). Dissociative anesthetics, including GHB, phencyclidine, and ketamine, do not meet these criteria, and so are included in a separate chapter.
