Synonyms for Neuroleptic (same or very similar meaning)
WordNet sense 1 (tranquilizer used to treat psychotic conditions when a calming effect is desired):
antipsychotic, major tranquilizer, antipsychotic agent, antipsychotic drug, major tranquilliser, major tranquillizer, neuroleptic agent, neuroleptic drugFrom the ODE community, based on WordNetadd/edit