anesthesia
"I had a minor procedure done to remove a piece of food that stuck in my throat. I also am on the fentanyl patch for the last 10 yrs for my constant pain. After about 2-3 minutes the first shot didn't have any effect on me. I was not sleepy at all. To make a long story short because of my pain management medicines they had to give me 4 shots to put me under."