Hallucinogens are drugs that produce distortions in sensory perceptions. A user might see strange colors, for example, or feel that time has slowed down. These drugs come in a bewildering variety, ranging from natural substances such as the mescaline in peyote cactus to synthetic drugs like LSD.

Users of hallucinogens typically are seeking pleasure, excitement, or a new mode of experience. Unfortunately, these substances have many unpleasant and dangerous side-effects, both physical and mental. Psychological reactions can range from temporary anxiety and depression to long-term mental illness. For this reason, psychiatrists have defined an entire category of mental illnesses known as hallucinogen-related disorders.

After tracing the history and patterns of hallucinogen use, this book examines each of the major drugs and the effects it produces. Finally, the book offers guidance in understanding hallucinogen users and helping them find appropriate therapeutic treatment.