Dipyridamole (Santinal MR) makes adenosine build up in the blood. This strengthens adenosine's effects on the heart and blood vessels. If the two really have to be used together, the doctor may need to change the adenosine dose. Never adjust the dose on your own.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.