Inderal oral is used to treat the following: 1  additional medication for treating pheochromocytoma, Essential Tremor, Migraine Prevention, High Blood Pressure, Myocardial Reinfarction Prevention, Angina, Idiopathic Hypertrophic Subaortic Stenosis, Hypertrophic Cardiomyopathy, Ventricular Rate Control in Atrial Fibrillation.