There are 4 classes, sodium blockers, beta blockers,
potassium blockers and calcium blockers. Class 1 and 3 (sodium and
potassium) are known to have somewhat more side effects than 2 and 4. All 4 have a potential to slow the heart rate (and in some people actually cause more PVCs).
I use a small dosage of beta blockers for my PACs and PVCs. It completely wipes out PACs during exercise and high adrenaline, but skipped beats (PVCs?