 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST] rial fibrillation). Treating heart failure may help maintain your ability to walk and exercise and may improve the strength of your heart. Treating an irregular heartbeat can also improve your ability to exercise.Digoxin belongs to a class of medications called cardiac glycosides. It works by affecting certain minerals (sodium and potassium) inside heart cells. This reduces strain on the heart and helps it maintain a normal, steady, and strong heartbeat. How to use Lanoxin Take this medication by mouth with or without food as directed by your doctor, usually once daily. If you are using the liquid form of this medication, carefully measure the dose using the dropper provided by the manufacturer. Do not use a household spoon because you may not get the correct dose. Your body may not absorb this drug as well if you also eat foods that are high in fiber or if you take certain medications. Take this medication at least 2 hours before or after eating food products that are high in fiber (such as bran). If you are also taking cholestyramine, colestipol, or psyllium, wait at least 2 hours after taking your digoxin dose before taking any of these products. If you are taking antacids, kaolin-pectin, milk </s>