Contraindications include * problems with the heart rhythm, such as severe bradycardia (slow heartbeat), ventricular tachycardia (fast heartbeat caused by the ventricles), ventricular fibrillation, or first- to second-degree atrioventricular block, * and certain electrolyte imbalances: hypokalemia (low blood potassium levels), hypomagnesemia (low magnesium), and hypercalcemia (high calcium).
Digitoxin
Digoxin
Amiodarone
Carvedilol
Metoprolol
Sotalol
Colestilan
Bisoprolol