Signs of Digoxin Toxicity

In this pharmacology question, we are asked to identify a sign of digoxin toxicity that patients should be educated to monitor.

Digoxin is a cardiac glycoside used to treat heart failure and certain heart rhythm problems. However, it has a narrow therapeutic range, meaning the difference between a helpful dose and a toxic dose is very small.

Let's evaluate the options provided to see which one aligns with classic toxicity symptoms.

First, we look at weight gain. Weight gain is usually monitored in heart failure patients to check for fluid retention, but it is not a primary symptom of digoxin toxicity itself.

The second option is fatigue and visual changes. This is a very common clinical manifestation of digoxin toxicity. Patients often report blurred vision, yellow-green halos, or general muscle weakness and exhaustion.