Composition for Betatrop 50mg/20mg Tablet Atenolol (50mg) + Nifedipine (20mg) Betatrop 50mg/20mg Tablet is a combination of two medicines: Atenolol and nifedipine which lower blood pressure effectively. Atenolol is a beta blocker that works specifically on the heart to slow down the heart rate while nifedipine is a calcium channel blocker which works by relaxing blood vessels. Together, they make the heart more efficient at pumping blood throughout the body.