In general, hallucinogenic mushrooms have a stimulant effect, that is, they cause wakefulness and a feeling of excitation in the body. They may also give you the chills or goose bumps.
Some people report yawning at the onset of effects, or runs of laughter.
All these effects generally wear off after four to six hours, leaving you tired, drained, and depleted of energy. You may feel hung over the next day. Overall, I know of no lasting ill effects from hallucinogenic mushrooms. More than a dozen species of psychoactive mushrooms grow in fields and woods of the US Pacific Northwest, Gulf Coast, and Southeast. In the Northwest, some deadly mushrooms in the genus Galerina can grow intermingled with the little psilocybin mushrooms.