Pain
"I have been on injection butorphanol for 19 1/2 years due to multiple injuries sustained in an assault on active duty. Unable to take any other narcotic I was put on this.  Though people are different it is almost impossible to get physically addicted to this medicine. It is very expensive, so after all these years of being in relative freedom of great pain I am now bed ridden due to the VA hospital refusing to pay for it anymore. "