Hypertension-
Child: 0.5-1 mg/kg PO qd in 2-4 divided doses. Maintenance: 2-4 mg/kg qd in 2 divided doses. Max 16 mg/kg/day.
Adult: 80 mg PO qd in 2-4 divided doses or sustained-release form once qd. Increase q 3-7 day. Max 640 mg qd. Maintenance: 160-480 mg qd.
Supraventricular, ventricular, atrial arrhythmias; tachyarrhythmias during anesthesia; hyperthyroidism, pheochromocytoma-
Child (arrhythmias only): 0.01-0.1 mg/kg slow IV push over 10 min. Max 1 mg/kg. Repeat q 6-8 h prn.
Adult: 1-3 mg slow IV in 50 ml D5W or NSS. Max rate 1 mg/min. After 3 mg infusion give another dose in 2 min; subsequent doses = q 4 h. Maintenance: 10-30 mg PO tid-qid.
Prevention of migraine, vascular headache-
Adult: 80 mg PO qd in divided doses or 1 sustained-release caps once qd. Maintenance: 160-240 mg qd, divided tid-qid. |