Digoxin. Medication quite old used for slowing heart rate in supra ventricular tachycardias, atrial fibrillation, and as positive inotrope to help strengthen heart muscle that is weak. It is not used as often now as in the past, but digitalis, the parent compound made from foxglove, dates back to the 18th century. Lanoxin (digoxin) is the brand name. It can and has been safely used in children and during pregnancy, .