My Doctor just switched me to Opana ER because I hated the sick feeling of the Morphine Sulphate and the Patches, had allergic problems with nearly all else. My worry is, I have been reading, hopefully wrong, that this "new", all new to me, Opana ER has Naltrexone in it. Please tell me that is not true. I don't appreciate drug companies not having this type of information on their sites regarding their own medications. But many patients keep speaking about this. I pick mine up tomorrow, too late to reach Doc, will ask Pharm. but I don't like this idea since I have a pretty, okay, very, sensitive stomach and it seems like an issue being danced around to prevent or stop addicts. Fine. I still want to know what I am putting in my body. Thanks