A 24-year-old university student commenced sertraline 50 mg daily three weeks ago for a depressive episode. His flatmates bring him to the emergency department because for the past five days he has slept about two hours a night yet describes limitless energy, talks so rapidly that he is difficult to interrupt, and has spent $4,000 on recording equipment for a music career he announced last week. He denies illicit drug use and his urine drug screen is negative. Which one of the following is the most appropriate next step in management?
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