Everyones' Physiology is different. What works for one may not work so well for another. I've been on Painkillers (Fentanyl, Morphine, Oxycodone, Oxycontin, Dilaudid. Vicodin) for 20 0dd years. I beleive I have it under control now and am not now addicted although I continue to use Oxycodone...