atrial fibrillation
"Worked to convert afib than dropped blood pressure too low.  Doc adjusted med but I had the worse headaches everyday just in the week I was on it. I had to lay down due to headache and very tired feeling each day.  



Looks like it works for many who have posted.  Trying metoprolol.   See it has a less favorable review but my hubby has taken it for years with no side effects.  Hoping for a great outcome."