Review Question - QID 217067

A 31-year-old man with a past medical history of schizophrenia is admitted to an inpatient psychiatric unit after emergency petition by the police. He has had 4 prior hospitalizations for decompensated schizophrenia, with the most recent admission being 4 months ago. During each hospitalization, he is stabilized with risperidone tablets, which have been highly effective and well-tolerated in treating his condition. Months after each hospitalization; however, he discontinues the medication or does not fill his prescription. Three weeks ago, he stopped his risperidone again and has since been slowly declining in function until being found today by police wandering in the street responding to internal stimuli. On examination today, he is guarded and appears distracted by internal stimuli. His temperature is 98.6°F (37.0°C), blood pressure is 127/88 mmHg, pulse is 77/min, and respirations are 14/min. The patient appears poorly kempt and is irritable. He is talking to himself and muttering. He walks with a steady gait. His pupils are equal and reactive and his strength and sensation is intact. Which of the following is the most appropriate management of this patient?