anesthesia
"Have had three colonoscopies in four years and can attest to the tremendous superiority of Propofol over "Twilight Sleep." After "Twilight Sleep" I was stupid and hungover all day. Plus my colonic inertia is worse than ever after any opiates. After Propofol I was mentally alert, physically steady and solid. Felt like I could take college boards exams 2 minutes after waking. 

For the most recent procedure, due to a mixup, I had to have the opiate-bomb again. I was very disappointed that I was going to feel like crap the whole rest of the day and have a bellyache the second. But most disappointing of all was that both the phlebotomist and the nurse tried to tell me the two drugs are exactly the same. They need to try them."