<prompt> Which drug is the most useful in treating an episode of antipsychotic induced acute dystonia ?LorazepamHaloperidolPromethazinePhenobarbitone  <response>: Ans. is c i.e., Promethazine o Antihistaminics have central anticholinergic propey e.g. promethazine and central anticholinergic is the drug of choice for acute dystonia. 