<prompt> A patient with acute psychosis, who is on haloperidol 20mgday for last 2 days, has an episode characterized by tongue protrusion, oculogyric crisis, stiffness and abnormal posture of limbs and trunk without loss of consciousness for last 20 minutes before presenting to casualty. This improved within a few minutes after administration of diphenhydramine HCI. The most likely diagnosis isAcute dystoniaAkathisiaTardive dyskinesiaNeuroleptic malignant syndrome  <response>: 48 hours of staing antipsychotics M.C inYounger black males If a patient develops dystonia he is more prone for eps Patient considers this as an Allergic reaction , thereby may stop drugs Layryngeal dystonia is a Psychiatric emergency, should be treated with IV lorazepam TREATMENT Diphenhydramine Benztropine mesylate Prophylactic anticholinergics helps Ref.Kaplon and sadock, synopsis of psychiatry, 11 th edition, pg no. 923 