Make sure that you recognize the symptoms of withdrawl sickness. Your doctor should explain this to you in detail. It took me about 10 weeks to wean off of a years use of morphine. I would reduce dosage, stay at that level for a week, and then the next week reduce a small amount again, and so on till I finally was free of the drug. If I went too fast, (eager to be free of the constipation, sleepyness etc.), chillls, shakes, and other issues came if I did it too fast.