Haloperidol

Haloperidol (also marketed as Haldol) is an antipsychotic medication that is most commonly used to treat schizophrenia, bipolar mania, acute psychosis, and tics in Tourette syndrome. Haloperidol works by blocking the effects of dopamine in certain parts of the brain.
Some of the possible side effects of haloperidol include drowsiness, constipation, weight gain, and dry mouth. Haloperidol can also cause movement disorders, such as shuffling gait or tardive dyskinesia (involuntary movements of the face).