Rythmol is one of the "milder" drugs as I understand choices, that and Propafenone are about the same, Rythmol is available in SR, Propafenone is not, so it has to be taken more often, a bother.
Aspirin is also the mildest measure to take for anticoagulant benefits, protection against clots. Better than Coumadin and aspirin has other benefits if it doesn't give your stomach problems...take with food.