It lasts several hours longer than either MDMA or psilocybin, and it has the greatest risk profile of any psychedelic.
Lysergic acid (LSD), mescaline, and psilocybin cause illusions and hallucinations.
It is common to have a bad psychological reaction to LSD, mescaline, and psilocybin.
psilocybin psil·o·cy·bin (sĭl'ə-sī'bĭn, sī'lə-)
A hallucinogenic compound obtained from the mushroom Psilocybe mexicana.