Regulators with the Food and Drug Administration have warned that Multaq, a cardiac drug Sanofi, has been linked with fatal heart problems in a clinical trial the company recently ended.
Multaq is prescribed to control atrial fibrillation, the most common type of irregular heartbeat which is found in about 2.2 million Americans. It is a condition in which the primary electrical impulse that causes the atria - the two upper chambers of the heart - to contract instead fires erratically, causing several other nodes, or electrical impulse points, to fire instead.