methadone 160mg a day and 60 roxicodone 15mg twice a day.i am only 29 been dealing with major back problems since i was 18 and i also take xanex for anxiety and sleep.i feel like since i been on the methadone so long they dont work as well as they used to i hear about the subutex but i would have to be on it for a long time and it would have to help my chronic pain.any suggestions?