atrial fibrillation
"My cardiologist took me off Toprol and Lisinopril because he "wanted me to know when I was having Atrial Fibrillation".  I am an EMT, so I know when I am in A-Fib.  The Flecainide did not help suppress the A-Fib.  I had more episodes while on the medication, was lightheaded while in A-Fib and felt like I was going to pass out.  My doctor took me off it and put me back on the other medications and I felt much better. "