Timely, It is Mexiletine Hydrochlolride 150 mg. They make it in 3 doses. Low, intermediate, and high. My EP said to start with low and adjust from there. I did have a drop in number of PVCs but not drastic and was sporadic.
The only issue is that it needs to be take every 8 hours. It has a quick exit from system versus other types and thus the need to do every 8 hours.

Have a upcoming home monitoring of ICD/Pacemaker which will determine the success or need to adjust based on number of PVCs the home test will show. I have this home test (called latitude) every 3 months and this will be first 3 month period since I started medication.

It was also recommended I take Magnesium 400 mg. which I already was. I asked my EP about taking potassium but was advised my last blood work showed normal levels so no additional supplement was recommended.