Other agents. Phencyclidine, marijuana, hallucinogens, inhalants, and anticholinergics.

Acute phencyclidine intoxication causes psychosis and a myriad of other symptoms and signs, some life-threatening. Anticholinergic poisoning is also a medical emergency, often requiring an intensive care unit. Marijuana and hallucinogens have rarely, if ever, resulted in direct overdose death, but intoxication can result in accidents or self-injury. Inhalants cause death from cardiac arrhythmia, suffocation, or accident. Each of these agents is associated with a variety of medical and neurologic complications, some of which are discussed at greater length elsewhere in this issue.