hello, well I have been on ideral for 22 years now, I take 40mg. 2x day. I was put on them because i was having fast heart rate, doctor thought maybe it was anxiety attacks. but now I am 41 and I have tachycardia. I do not have side effects from inderal. the doctor wanted to switch my meds, but I am so afraid to, because I been on them for so many years now. hope this helped you. have a great day.