List of NDC products with proprietary name multaq. This medication is used if you have had certain types of irregular heartbeat (paroxysmal or persistent atrial fibrillation) in the past but now have a normal heart rhythm. It helps you keep a normal heart rhythm and lowers your chance of having to go to the hospital for atrial fibrillation. Dronedarone is known as an antiarrhythmic drug. This medication should not be used if you have permanent atrial fibrillation because of the increased risk of very serious side effects. See also Warning section.