to study the safety and feasibility of abruptly changing antianginal therapy from propranolol hydrochloride to verapamil , we gave propranolol to ten patients with stable angina and coronary artery disease for 14 days , then , on day 15 , we began verapamil therapy , which continued for 14 more days .
C0282321
propranolol hydrochloride
C0033497
propranolol