anesthesia
"I'm on Methadone for Phantom pains I have from severe nerve damage I received from a gunshot wound and a hand amputated. Because of the methadone my resistance to other pain  and anesthesia medicines that I require Propofol. I found this out the hard way, I had a liver Biopsy that required the Dr to insert a long steal probe into the main artery in the side of my neck, then down to the internal parts of the liver. Unfortunately I wasn't aware when they were going to begin the procedure because of a full face cover they had on me.  The Dr came unglued when he heard me say, " Man that hurts....! so since then I demand Propofol with any procedure requiring anesthesia!"