MSFinals-5500

A 70-year-old man comes in for his routine psychiatric follow-up appointment. He has a history of schizophrenia that has been difficult to manage, but has been stable for the past 5 years on various antipsychotic medications. He also has type II diabetes. During the appointment, he reports experiencing repetitive, involuntary movements of his lips and tongue, including lip smacking and grimacing. Which medication is the most likely culprit for these symptoms?