The fact that you are still having intolerance to the Flecaidide may be your body telling you that it is TOXIC in one way or another. Can you choose a drug or a combination of supplements that heal or at least manage the arrhythmias? The information is in Google if you search. Certainly, my arrhythmias were caused by an accumulation of toxins. Our world is becoming overrun with them, including factory foods and synthetic (chemical) drugs. Just food for thought.