The only person who gets better on stage while medicated is Perry Farrell. He is a HOOT when he's on something. During the beginning of the NINJA tour he pulled a calf muscle. They gave him vicodin and told him to rest (RIGHT before I was about to leave to see them in Vegas) well he took the pain meds but said fuck the rest....and Vegas had to be ONE OF THE BEST SHOWS. He was animated, dancing all over the place, humping the floor, "fucking" a floor monitor...and his rant during Pigs in Zen was CLASSSSSSIC. I actually video taped it.
And he doesn't use a tele-prompter.