Psychiatry – MCQ 8 – A patient with acute psychosis, on haloperidol for last 2 days

A patient with acute psychosis, who is on haloperidol 20 mg/day 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 HCl. The most likely diagnosis is:
a) Acute dystonia
b) Akathisia
c) Tardive dyskinesia
d) Neuroleptic malignant syndrome

Correct answer :
a) Acute dystonia