You can take up to 200 mg of Flecainide daily if you are under 160 lbs of body mass (with some variance of course, but it's a general guideline). Over that weight, titrate up to the allowable limit per your EP/cardiologist's instructions. Generally, you would up the dosage in discrete steps, say 25 mg/day, but not incrementally each day. IOW, you try an additional 25 mg for at least two days to see if that nips the PVCs. If no improvement, you add an additional 25 for a total of 'new 50 mg', again for at least two full days. Taking larger doses for only one day, and then adding, is not going to show definitively that the increased dosage will work. Give each increase time for your heart to adjust.

As always, make adjustments to any medication with consultation of a professional competent in the field. Take my suggestion, and that's all it is, for what it's worth.