I have a bad back. I am suppose to take the morphine when I wake up and one 12hrs later. In between I take oxycodone for pain. The thing is I do not notice a difference at all when I take the morphine. Is that normal? When I think of morphine I think whoa..major drug. I just do not notice a difference in the pain at all. Is this normal or do I have defective meds? I do not want to take more then the dr says but im in pain!! help please!