It is often sold as mescaline, THC, or other drugs. Sometimes it may not even be PCP, but a lethal by-product of the drug. Users can never be sure what they are buying since it is manufactured illegally. Mescaline comes from the peyote cactus and, although it is not as strong as LSD, it's effects are similar. Mescaline is usually smoked or swallowed in the form of capsules or tablets.
Psilocybin comes from certain mushrooms.
The mushrooms themselves, fresh or dried, may be eaten. It's effects begin almost immediately and last for 30-60 minutes. The effects of psychedelics are unpredictable. It depends on the amount taken, the user's personality, mood, expectations, and the environment in which the drug is used. Usually, the user feels the first effects of the drug 30-90 minutes after taking it.