Oral
Hypertension
Adult: Initially, 1 mg at bedtime, may be doubled at 1-2 wk intervals according to response. Maintenance: Up to 4 mg once daily. Max: 16 mg/day. Extended-release: Initially, 4 mg once daily, may increase to max 8 mg once daily after 4 wk.
Oral
Benign prostatic hyperplasia
Adult: Initially, 1 mg at bedtime, may be doubled at 1-2 wk intervals according to response. Maintenance: 2-4 mg/day. Max: 8 mg/day. Extended-release: Initially, 4 mg once daily, may increase to max 8 mg once daily after 4 wk.