Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
A hallucinogen is a type of drug that alters perception, mood, and cognition. It can cause hallucinations, distortions in time and space, and changes in sensory experiences.
Related terms
Psychedelic: Psychedelics are a subgroup of hallucinogens that produce intense visual and auditory hallucinations, as well as profound changes in consciousness.
LSD (Lysergic Acid Diethylamide): LSD is a powerful psychedelic drug that causes vivid hallucinations and altered states of consciousness.
Psilocybin: Psilocybin is the active compound found in "magic mushrooms" and is known to produce hallucinations and altered perceptions.