• PO (Adults): 75 mg/day in divided doses; may be ↑ up to 150 mg/day or 50–100 mg at bedtime, may ↑ by 25–50 mg up to 150 mg (in hospitalized patients, may initiate with 100 mg/day, and ↑ total daily dose up to 300 mg)..

• PO (Geriatric Patients): 10–25 mg at bedtime; may ↑ by 10–25 mg weekly if tolerated (usual dose range = 25–150 mg/day)..