after 12 yrs of 340 ocycontin, then ms contin was added, by a different dr., and yet a 3rd put me on opana and tramadol. I went through terrible withdrawals w/out any oxy at all. Then, he added percocet. I still feel off. Would I have been better off to have used the ms contin, as for as the withdrawals. I personally don't think that Opana is all itis cracked up to be.(I am terminal) Naylyn Dill