Hello Daz
I have never had any side effects, but I was and am still on 2 tablets of 80mg of sotalol per day. One in the morning, one at night. I suspect your one heavier dosage per day is not working for you. Don't be afraid to tell your doctor you would like to change, perhaps later if it ever becomes permanent, you've got years yet!! I was the same as you, I never took them until I had a phase and it did not hurt. There is no need to take blood thinners unless you are having a phase. Be advised, AF and the flu don't agree. Start having the flu jab, and if you get the flu make sure you keep up the fluids. Mine started when I was 50, it only went permanent three years ago I am now 71. Best of luck, you'll be fine!!