"i was put on this medication by a new doctor who didn&#039;t like that i was on fentanyl patches.  i was put on the 10 mg to start.  the first couple of weeks everything was great, no pain.  but then i started having severe muscle and joint pain.  since i have lupus and sjogrens i am used to joint pain but this was worse than normal.  i tried taking the patch off and the muscle aches stopped.. but the other pain i had was worse.  my doctor thinks i need to take a higher dose... so i tried the 20 mg.  made me so sleepy i couldn&#039;t keep my eyes open.  i wonder if any other people have had the side effect of severe muscle aches. i wish i could find something to make it stop."