Review Question - QID 204824

A 52-year-old male with a history of chronic hepatitis C presents to the emergency department with his wife. His wife states that she is very concerned because she thinks that he "isn't thinking straight." She states that he awoke this morning and did not appear to know where he was. She also states that over the past 2 days he developed a productive cough and fever. On exam, the patient appears altered and his vitals are shown as Temp: 38 deg C, HR: 77 bpm, BP: 134/98 mmHg, RR: 12, SaO2: 97%. The physician observes the findings shown in Figure A and Figure B. Furthermore, when the patient holds his hands as demonstrated in Figure C, they oscillate as though he is slapping the air. A chest radiograph is obtained, which is demonstrated in Figure D. In addition to appropriate antibiotic therapy, what other medication should be initiated in this patient?