Has anyone heard about the new Opana ER? My Dr said there is a new formula and he is giving me an option to stay with the new Opana ER or switch to Nucynta ER. Opana has a ruthless withdraw symptoms. I have experienced if I did not take my meds on time. I do not want to experience anymore. I have known people who have stopped taking Opana and they were sick for days sick is saying it lightly. Let alone dealing with the withdrawals with my severe pain in my neck, back, legs etc. along with chronic pain. I need to know if Nucynta will help with the pain and keep me from suffering wd's. Is there a comparison between these 2 drugs or is there other meds that help manage pain as well as Opana?