<prompt> A patient of schizophrenia treated for 5 years developed perioral movements. Likely diagnosis is -Tardive dyskinesiaMuscular dystoniaAkathas i aMalignant neurolept syndrome  <response>: Perioral movement after antipsychotic therapy occurs in two syndromes:-Tardive dyskinesia Facial muscles perioral muscles show involuntary movement.Rabbit syndrome Perioral tremor.Perioral muscles are also involved in acute dystonia, but there is a spasm of muscles not movement and it occurs within a week after initiation of the drug. 