There was a classic bit in a House episode that I saw the other day. Some guy had had brain cancer which had resulted in paralysis after it was surgically removed. He'd been in a wheelchair for eight or so years and they made reference to how all his muscles had atrophied and stuff.
Then House comes up with some magical diagnosis of Addison's Disease, they inject the guy with cortisol and five seconds later he manages to lift himself out of his wheelchair and hug his wife and son. I'm fairly sure that:
(a) Cortisol wouldn't cure the disease in such a way: the effect was instantaneous!
(b) Someone who has been in a wheelchair for eight years, and whose muscles have atrophied would not be able to stand up out of that wheelchair without some serious assistance.
I hardly know anything about medicine but even I could see that that was absurd! I think that medical dramas misrepresent a hell of a lot of stuff, probably to the same extent as legal dramas. It's far more dramatic to have somebody's condition improve or detiorate in a couple of seconds, than it is to have it do so over a matter of weeks!