A hallucinogen is a psychoactive agent which can cause hallucinations, perceptual anomalies, and other substantial subjective changes in thoughts, emotion, and consciousness. The common types of hallucinogens are psychedelics, dissociatives and deliriants.
Lysergic acid diethylamide, also known as LSD, is a hallucinogenic drug. Effects typically include altered thoughts, feelings, and awareness of one's surroundings. Many users see or hear things that do not exist. Dilated pupils, increased blood pressure, and increased body temperature are typical.
A psilocybin mushroom is one of a polyphyletic group of fungi that contain any of various psychedelic compounds, including psilocybin, psilocin, and baeocystin. Common, colloquial terms for psilocybin mushrooms include psychedelic mushrooms, magic mushrooms, shrooms, and mush.
Phencyclidine, also known as angel dust among other names, is a drug used for its mind-altering effects. PCP may cause hallucinations, distorted perceptions of sounds, and violent behavior. As a recreational drug, it is typically smoked, but may be taken by mouth, snorted, or injected.