Propofol
"I'm 66 and had my first colonoscopy yesterday. I'd never had a general anesthetic before, and didn't know what to expect. On the operating table when he said he was beginning to administer the medicine I thought I should start feeling sleepy within a few seconds. Then the nurse said the procedure is over and asked how I felt. It was just that fast. No feeling of losing or regaining consciousness. Afterward I was completely clear-headed and in good spirits. I couldn't ask for any better experience for general anesthesia."