I would taper slowly and under the direct supervision of the physician who prescribed the oxycontin. Cannabis will potentiate the effects of opiates. This means that if you add cannabis to your treatment regiment, you can achieve greater pain relief with less opiates. Try various forms of cannabis, including inhaled, edibles, sublingual and topical. CBD is also very effective in reducing inflammation, and is well tolerated in very high doses. Use whole plant cannabis products as the other compounds in the plant will have effects as well. Eat a balanced diet and get plenty of sleep and engage in moderate exercise.