I have been on OxyContin 40 mg Er for some time for compression fractures chronic moderate to severe pain, my insurance company is making me try 3 other meds before continuing coverage of the Oxy 40 er. we have tried MS Contin and that caused side effects, then Opana 20mg ER that didn't help my pain and also side effects, the last med to try is Nucynta Er and I am not sure if this will be effective and would like your opinion of the drug.