Mescaline is a natural hallucinogen. It is a white powdery alkaloid obtained from the dried tops (called mescals) of a small, spineless, peyote or whisky cactus, Lophophorawilliamsii. It causes alteration in mood, changes in perception, reveries, visual hallucinations, delusions (false belief), depersonalisation (to lose the feeling of one’s own reality), etc. Mescaline also increases temperature and blood pressure.