Digoxin is a cardiac glycoside medication primarily used to treat heart failure and certain types of irregular heartbeats, particularly atrial fibrillation. It helps the heart beat stronger and with a more regular rhythm, improving blood circulation throughout the body.

Propranolol is a non-selective beta-blocker used for high blood pressure, angina, irregular heartbeats, and performance anxiety.

Atenolol is a beta-blocker used to treat high blood pressure, prevent angina, and improve survival after a heart attack.

Metoprolol is a beta-blocker used to treat high blood pressure, chest pain (angina), and heart failure.