Thanks so much for your posted question. I searched our site and found this information on Coreg:
This medication is an alpha and beta blocker used to treat high
blood pressure and heart failure. It is also used after a heart
attack to improve the chance of survival. Lowering high blood
pressure helps prevent strokes, heart attacks, and kidney
problems.
This drug works by blocking the action of certain natural
chemicals in your body (such as epinephrine) that affect the heart
and blood vessels. This effect lowers heart rate, blood pressure,
and strain on the heart.
Hope this helps and all the best, sue