psychedelic drug

Any drug that produces hallucinations or altered states of consciousness. Such sensory experiences may be in the auditory, visual, tactile, olfactory, or gustatory fields or in any combination. Among drugs known to have psychedelic effects are LSD (lysergic acid diethylamide), mescaline, and, to a mild degree, marijuana, along with a number of other plant-derived or synthetically prepared substances.

Most of these drugs can cause temporary or recurring psychotic episodes.