Mescaline is a chemical in the peyote cactus, being found in small buttons that grow on top of the cactus. Mescaline is a hallucinogen obtained from the a small, spineless cactus Peyote. Mescaline is classified as a hallucinogen, the same class of drugs as LSD, psilocybin, PCP and dimethyltryptamine (DMT). Mescaline, or 3,4,5-trimethoxyphenethylamine, is a naturally occurring psychedelic alkaloid of the phenethylamine class, known for its hallucinogenic effects comparable to those of LSD and psilocybin