I started taking propafenone this past Tuesday (4 days ago) and it makes me very lightheaded and increases my breathing difficulty, I have copd, using Metoprolol and an inhaler. It also drains my energy. The EP nurse said I could stop the Propafenone and after a few days they would start me on Flecainide. I see a lot of people on the forum are taking Flecainide and my question is which one has the least side effects. I know that we all are different and results vary.