Betablockers like atenolol, metoprolol and propranolol made my condition much worse, as they can lower
your blood pressure. I was on the wrong meds
for almost 2 yrs before my new doctor figured out that the problem was POTS. As I tapered off the betablockers, my heart rate stayed the same, but my energy increased a bit and I had much less fainting/dizzy spells.