The pain of angina is caused by a deficit in oxygen supply to the heart. Calcium channel blockers like Verapamil
will dilate blood vessels, which increases the supply of blood and oxygen to the heart.
is an alpha-adrenergic agonist used as an antihypertensive. Its use is now mostly deprecated following the introduction of alternative safer classes of agents. However, it continues to have a role in otherwise difficult to treat hypertension
Since the earlier combination of medicines was not able to control your high blood pressure
and verapamil is a very good vasodilator,that is the reason you are getting a good response with combination of verapamil and aldomet.