Review Question - QID 109373

A 27-year-old man is brought to the emergency department after he was found locked in a bathroom at a local gas station. The patient states that he was being followed. He is unable to reveal additional medical history. The patient’s sister is contacted and states that he has trouble taking care of himself and has observed him maintaining a dialogue without anyone else present. The patient’s temperature is 99.5°F (37.5°C), pulse is 90/min, blood pressure is 120/70 mmHg, respirations are 14/min, oxygen saturation is 98% on room air, and BMI is 22 kg/m^2. The patient is given appropriate treatment and transferred to the inpatient psychiatric unit. Three weeks later, the patient is on maintenance therapy and is grooming himself properly, denies hearing voices, and no longer believes he is being followed. His BMI is 29 kg/m^2. Which of the following medications is most likely responsible for this patient's change in body mass index?