I can only speak for myself, but I did not do well taking too much metoprolol. I found myself with a heart rate near 30 BPM when my daily total went past 125 mg. This was immediately after a spike near 148 BPM. In fact, that was after a first failed ablation. I went on Amiodarone and dropped the metoprolol cold...no further dosage as soon as the ER physician ordered Amiodarone.

Try cutting the dosage of metoprolol by 50% for a couple of days (you should consult your care giver first, though). See what happens. You may find that the Flecainide does all you need from medications.

The arrhythmia, if it happens, is not lethal...not for several weeks or months...UNLESS the heart rate exceeds 100 and seems to want to remain that high. Never go more than 24 hours with a heart rate higher than 100.