"i have been on opana er 60mg 3x a day for over a year now for chronic back pain.  it is wonderful.  nothing has ever worked for me like it has.  not fentanyl patches, not oxys, nothing.  i suggest any of you have a genetic test done by your pain doctor. i did.  it allows your doctor to be able to tell what pain meds work for you the best.  it isn&#039;t always about what med is the strongest, its about what your body will use."