What are the initial side effects of LSD?

During the early stages of the LSD trip (the come-up), side-effects include a tingling body sensation, nausea, dilated pupils, and euphoria. During the peak of the LSD trip, effects include visual hallucinations, increased appreciation of music, delusional thinking, and subjective feelings of increased insight or awareness. The trip wears off after about 8-12 hours, but users may still feel some of these effects.