Acid, or lysergic acid diethylamide (LSD), is an illegal recreational drug derived from a parasitic fungus that grows on rye, known as ergot. Acid is the most well-known hallucinogenic drug, and due to the extended effects of the drug, the experience of taking or "dropping" acid is known as a "trip" or "acid trip."

Who started the psychedelic movement?

In the 1960s the use of psychedelic drugs became widespread in modern Western culture, particularly in the United States and Britain. The movement is credited to Michael Hollingshead who arrived in America from London in 1965.

Is Serotonin a hallucinogen?

Serotonergic psychedelics (also known as serotonergic hallucinogens) are a subclass of psychedelic drugs with a method of action strongly tied to the neurotransmitter serotonin.