"i have been taking 4 of the 40mg for about two years, because it works better than anything else i have had, and that is every other narcotic, for my spondilolisthesis. it kills the pain and i can work like a 20 year old and do everything i want, but without it, i feel like the 48 year old i am. i highly recommend this pain medicine to anyone with chronic pain. i would much rather take these than have bone fusion surgery. "