BY DRUG Hallucinogens produce their effects by affecting the neurotransmitter. The result is altered nerve impulse transmission that can cause the changes in perception and hallucinations that accompany the use of these drugs. Mental reactions can include the following. Abrupt mood changes. The physical reaction to using hallucinogens also depends on the amount and type ingested and the user's tolerance to it.
Physical reactions can include the following.
Nausea and vomiting. Constipation, diarrhea, difficulty urinating. Fever, sweating, shivering. Although hallucinogens do not appear to be either physically or psychologically addicting, quitting them can be difficult for the chronic user. Seek help from a doctor or a specialist in chemical dependency.