May cause hallucinations, orthostatic hypotension, fibrosis, somnolence. Use with caution in cardiovascular disease (hypotension may cause coronary ischemia), in cerebrovascular disease (hypotension may cause cerebral ischemia), in pre-existing dyskinesias (may be exacerbated), in hepatic impairment, in risk factors for torsade de pointes (hypokalemia, hypomagnesemia, bradycardia, concurrent use of drugs that prolong QTc, or genetic predisposition), or in renal impairment. Pre-treatment with antiemetic is necessary (avoid pre-treatment with antidopaminergic and antiserotonin antiemetic agents). Contains metabisulfite (may cause allergic reactions). Dopaminergic agents have been associated with a syndrome resembling neuroleptic malignant syndrome on abrupt withdrawal or significant dosage reduction after long-term use.