Digitalis glycosides are a group of compounds derived from the foxglove plant, primarily used in medicine to treat heart conditions. They work by increasing the force of heart contractions and regulating heart rhythm, making them beneficial for patients with heart failure or atrial fibrillation. These compounds, including digoxin and digitoxin, have been used for centuries. While effective, they require careful dosing due to their narrow therapeutic range, meaning that too much can lead to toxicity. Regular monitoring and medical supervision are essential when using digitalis glycosides to ensure safety and effectiveness.