Orofaciolingual dyskinesia due to diphenylhydantoin sodium

A 60-year-old woman was referred to our emergency services with a 2-day history of abnormal facial movements. She had been in a recent road traffic accident following which she developed subarachnoid haemorrhage and had seizures. She was on oral diphenylhydantoin sodium 100 mg thrice daily for the last 17 days. She was not on antipsychotics or any other antidopaminergic drugs. On examination, she was conscious and alert. Her pulse rate was 80/min, regular, blood pressure 120/80 mm Hg and temperature 98.4°F. Higher mental functions were normal and cranial nerves examination was normal. Her pupils …