<unk> (tablet) is an antiarrhythmic that is FDA approved for the treatment of ventricular arrhythmia. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include bradyarrhythmia, hypotension, photodermatitis, photosensitivity, thyroid dysfunction, constipation, loss of appetite, nausea, vomiting, increased liver enzymes, abnormal gait, coordination problem, dizziness, movement disorder, paresthesia, peripheral neuropathy, corneal deposit, visual disturbances, malaise, and fatigue.
Amiodarone 
Benziodarone
Colestilan
Flecainide
Verapamil
Dimetilan
Tocainide
Procainamide