chronic pain
"Takes away all pain. I was told that this is a drug that works differently for people. I am one of the lucky ones. Very quickly takes away all pain. I was given it intravenously immediately after surgery, first for a hernia and second for a cat bite that had resulted in a septic joint. My partner will not take it because it made her feel nauseous. I have no nausea. 
Interestingly, morphene had no effect on me despite being supposedly the more effective medication for pain. The lesson is that different people's bodies respond differently."