I'm 18 and had heart rate of around 80-120bmp resting for the last two weeks and anxiety attacks about my heart cutting out for the past two weeks.
Doctor gave me 2.5mg of propranolol to take once a day (sounds very small compared to other amounts people have mentioned.) Nows its about 58-70bmp.
Had a few feelings of anxiety earlier about my heart being to slow and had one or two feelings of minimal chest pain, but i suppose that is just me worrying to much!!!
Edit: ahhh okay just read my medicine again after thinking it was propanolol and researching it, and it is Bisoprolol (Fumarate) 2.5mg. I am really worried now as i can't find any info from people who have taken it :-s