Review Question - QID 216710

A 19-year-old man presents to the emergency room after being brought in by his roommate for abnormal behaviors. After starting college 9 months ago, he began dressing in only religious attire and neglecting his hygiene. Three months ago, his roommate realized that he stopped attending classes or completing homework assignments. When the patient was asked about his behaviors, he told his roommate that he was "protecting humanity from the devil," but was unable to elaborate further. The patient's roommate ignored these behaviors until the day prior to presentation, when campus security called him for information. The campus security team had received calls stating that the patient was harassing other students in the library, whom he believed were trying to kill him. Prior to presentation, the patient's only known medical history was mild asthma. His vital signs include a temperature of 98.6°F (37°C), blood pressure of 132/87 mmHg, pulse of 92/min, and respirations of 18/min. On examination, the patient appears disheveled with a paranoid mood and constricted affect. He is unable to provide a coherent history and appears preoccupied with his thoughts. His BMI is 17 kg/m^2. Which of the following is the most appropriate next step in the management of this patient?