Af was detected in 2012 for me with 240bpm. First Cordarone 100 was given thrice daily. Thereafter reduced to 50 mg. I have taken the medicine till 2016. Later another Cardiologist switch me over to Bisoprolol 2.5 . Last September Holter showing AF of 76 bpm. Bisoprolol dose increased to 5 mg. Can anyone say that I will remain safe with this drug? Or I have to restart Cordarone again?