I initially agreed to try Flecainide but I was also in NSR at the time with only a very occasional PAC so I thought this option might be an alternative to ablation at this time. I found my chest pounding at night, constipation, vague headachy feelings--none of these were "normal" for me. I went to the drug book (I'm a retired nurse) and the first thing I noted was three (THREE) Black Box warnings about the serious nature of this medication. I started taking 1/2 doses for three days and then none. I almost immediately felt more normal for me. I am not saying this is a bad med, just a very serious med to be taking without any real valid ways to prove it is working. I am fine on a rate control drug and I am planning an ablation soon. I am sorry about your husband's experience. Even I was too trusting to try something without thoroughly checking it out. I hope your husband is okay and that he is able to take something else less "lethal". Physically and psychologically I just wouldn't ever be comfortable on this med.