Adult & childn >12 yr Angina pectoris 20 mg 3-4 times daily, increase gradually to 40 mg 3-4 times daily. Max: 200-280 mg daily.
Cardiac arrhythmia 10-30 mg 3-4 times daily.
HTN 20 mg 3 times daily, increasing to 40 mg 3-4 times daily after 3 days.
Migraine (prophylaxis) 40 mg 2-3 times daily.
Hypertrophic obstructive cardiomyopathy 10-20 mg 3-4 times daily.
Childn <12 yr ½ adult dose.