"i started taking oxycontin over 3 years ago for chronic pain in my back and left leg and foot. i have peripheral neuropathy, reflex sympathetic dystrophy, sciatic nerve injury, drop foot and have been told i have pinched nerves. all i know is that i have pain. i started taking 40 mg 3 times a day then 80mg twice a day and now my doctor has me on morphine sulphate 100 mg 3 times a day. he said to do this i won&#039;t need to continue raising the dose of the oxycontin. the morphine sulphate has not helped as much as the oxycontin."