Provocation or aggravation of ventricular arrhythmias
2nd or 3rd-degree AV block
Sinus bradycardia
Dizziness
Blurred/abnormal vision
Headache
Encainide
Flecainide
Verapamil
Procainamide
Propafenone
Amiodarone
Ibutilide
Lofexidine