Adverse effect of antipsychotics.
More common with high-potency typical antipsychotics, but can also occur with atypical agents
Due to antagonism of dopamine-2 receptors in basal ganglia
Extrapyramidal reaction
Chorea
Sedation 
Sydenham's chorea
Hallucinations
Neuroleptic malignant syndrome
Altered mental status 
Serotonin syndrome