<prompt> Drug given for metoclopramide induced dystonic reaction is:PheniraminePromethazineChlorpromazineProchlorperazine  <response>: Ans. B PromethazineRef: KDT 8the p180Acute muscle dystonia caused by antiemetic-antipsychotic drugs is promptly relieved by parenteral promethazine or hydroxyzine This is based on central anti-cholinergic action of the drugs.Promethazine is a first generation anti-histaminic which has maximum penetration of blood brain barrier and maximum anticholinergic activity. 