hallucinogen /həlo̅o̅″sənəjen′, hal′əsin″əjən, hal′yəsin″əjən/ [L, alucinari, to wander in mind + Gk, genein, to produce] , a substance that causes excitation of the central nervous system, characterized by hallucination, mood change, anxiety, sensory distortion, delusion, and depersonalization; increased pulse, temperature, and blood pressure; and dilation of the pupils. The ingestion of hallucinogenic substances may cause psychic dependence and depressive or suicidal psychotic states. Kinds include lysergide, mescaline, phencyclidine hydrochloride, psilocybin.
