I take 60mg inderal LA a day for tachyacardia and palpitations. I have been on it for almost 3 years. Off and on I experience joint pain and muscle aches that last for a few days and then go away. For the past couple of months the joint pain has occured a little more frequently. I am 39 yrs. old. Do you think this could be a side effect of the inderal, and if so is it something I should be concerned about? There are alot of days I have no pain at all. Can you please suggest what you feel I should do. I tolerate the inderal otherwise fairly well, so I hate to change medicines. Thank You.