Review Question - QID 210712

A 16-year-old boy is brought to the emergency department because he had an episode where his arm started flailing without his control. He has never had an episode like this; however, his mom has noticed that his movements over the last 6 months appear to be slower and more rigid than usual. Furthermore, he has fallen a number of times while walking to school. Finally, she notes that although he was always a very kind child who performed well in school, he has become increasing combative and is failing his classes. On presentation, the patient exhibits muscle rigidity upon passive motion as well as the finding shown in Figure A. Which of the following treatments would most likely be used for this patient?