A 27-year-old female started on aripiprazole 10 mg daily for a first episode of psychosis returns after 5 days reporting an intense inner restlessness and an irresistible urge to move. She paces continuously during the interview and cannot sit still, stating she feels like she is 'crawling out of her skin.' She denies worsening psychotic symptoms, depressed mood, or suicidal ideation. Her vital signs are normal. Which of the following is the most appropriate initial management?