My mother had been prescribed MS Contin or Oxycontin to choose from. She has an irresistible pain in her back, so she needs the stronger one I guess. These drugs have different active ingredients in their composition - MS Contin is based on morphine and oxycontine includes oxycodone. I heard different opinions: some people say that Morphine is stronger, the other deem oxycodone is the best. I’m not a doctor and have never taken neither of them, so I need an advice from experienced people. Mother’s doctor said it doesn’t matter; both are suitable in mother’s case. But I need such a painkiller for her to be sure she’s not suffering anymore.