I am just starting Rythmol generic Propafanone (6th day). I also have been taking Atenolol for the last 10 years, before and after I tried and failed Norpace. By bp and hr were going down yesterday, so I delayed the dose, as I have done over the years. I had an extreme dizzy spell - close to fainting - and as I happened to be near the Cardiologist's office, I called to see if I could get an ekg, as he had advised if I felt weak. His nurse grudgingly conceded I could get the ekg, but said I had to be taking Atenolol with the Profafanone. Apparently Atenolol is needed as a counterpart to this drug. Anyway, she told me to take one half of my 25 mg. Atenolol last night (I'd been without it for about 13 hours at this point) and they would read the ekg this morning and she would call me. I have yet to hear back and will call by the end of the day if I don't hear, but am kind of annoyed that this was not made clear to me. I requested a copy of the print out and even tho it was labeled "abnormal" the tech said "I would not let you leave here if this was a real problem." After the ekg, I went to my heart support group in the same building and a nurse in the group said it was not bad and it showed a few beats originated from a place other than the AV node, which is the problem with afib. She said she thought I was just adjusting to the medication. She also said the beta blocker keeps the heartbeat strong. My heart rate has been as low as 48 and bp down to 85. I am trying to stay hydrated as the nurse suggested and that seems to be of some help. I have not been doing much during this changeover in meds and am feeling a little lightheaded. Not sure if it is the meds or my lack of activity. Any feedback would be appreciated.