I hope these prescriptions were made by the same doctor, that is you are not getting prescriptions somehow without the prescribing doctor knowing all of the medications you are taking. I agree with spade22. It may be easier to ask the pharmacist who fills your prescriptions.
I have taken high dose propafenone (240 mg three times a day, best I can recall) and beta blockers at the same time. I now take both a beta blocker and a calcium channel blocker to lower my heart rate. I suffer from atrial fibrillation.
This is a great question for your doctor or pharmacist.