Haldol is the brand name for haloperidol, an anti-psychotic medicine used to treat mental and mood disorders, including schizophrenia and acute psychosis.It is often used in emergency room psychiatric situations.It helps reduce aggression, negative thoughts, and the desire to harm someone or oneself.: Haldol (haloperidol) is an antipsychotic medication that is used to treat psychosis, Tourette's Syndrome, and agitation. Recent studies have suggested a link between haloperidol and breast cancer.