I was on Oxycontin for 3 years and then fentanyl for one year. Stopped cold turkey, not a pleasant experience. Took three tries before I could do it. The first time I had fallen asleep and woke up with the worse case of uneasiness you could possibly imagine. It was so bad I chewed a couple of oxys. The second was even worse, the third time I went through a week of cold sweats and jitters. I craved it for over a year. When I had my open heart surgery three years ago I only had morphine the first day, after that it was only tylenol.