"i was taking oxycontin 20   with oxycodone 15 for breakthrough qid for severe back pain/spinal stenosis. previous surgery 30 years ago and no known surgery to help except the experimental approaches with cages to lift. i&#039;m in the business so not interested. anyway, knowing my pharmacology, i moved from oxycontin (4 hours half life to zohyrdro 8 hrs half life. and, its&#039; spot on. neither is a true bid drug but zohydro comes close and gives you maybe 6-7 hours of good sleep and if you wake up with breakthrough, take an oxycodone, wait 45 minutesw and go back to bed. don&#039;t take another zohydro. fairly flexible. eally works well for me. so much better than force fitting a tid or even a qid oxycontin as a bid. look at the pharmacodynamics please"