What is a common use of digoxin?

Digoxin is primarily used to treat heart failure and certain types of irregular heartbeats, such as atrial fibrillation. It works by improving the efficiency of the heart, allowing it to pump more effectively. By increasing the force of myocardial contraction, digoxin helps to alleviate the symptoms of heart failure, such as shortness of breath and fluid retention.

In the context of heart failure, digoxin plays a vital role in managing the condition by enhancing cardiac output and helping to control the heart's rhythm. This makes it particularly beneficial for patients who are experiencing heart failure symptoms.

The other options involve mechanisms or uses that are not characteristic of digoxin. For instance, while it can have some influence on heart rate, its primary intent is not to increase heart rate but to control irregular rhythms or increase the strength of contraction. It’s also not used specifically to lower blood pressure or relieve pain, which aligns it with different medication classes.