Morphine is, for the most part, not very affective against rsd. I use methadone with other pain meds, and after being on morphine, oxy, fentanyl (just to name the narcotics) methadone has worked the best. Even at the low dose I am on now, works better than 100+ a day of morphine sulfate/kadian.
That is just my experiences and many others feel the same.