Major tranquillizer Major tranquillizer antonyms If you know antonyms for Major tranquillizer, then you can share it. Suggest antonym for Major tranquillizer Major tranquillizer synonyms antipsychotic neuroleptic antipsychotic agent major tranquilizer major tranquilliser antipsychotic drug neuroleptic drug neuroleptic agent antianxiety agent ataractic ataractic agent Full list of synonyms (15)