I can't remember the movie title but I remember a few scene I watched a movie about 11 years ago and I remember a guy had a rock climbing or moutain climbing accident or something I don't know but another guy finds him and saves his life even though he is messed up.. and the guy that saves him is a scientist or something maybe? But anyway they go to this base near by and the survivor lives there with the scientist and a girl for a while and needs a certain thing to survive? So he's taking it like medicine but in the end he tries to kill the scientist and the girl because he wants to eat there brains? Sorry if this makes no sense I was about 8 when I watched it and I really wonna know.. at the end they escape in a little plane but the guy/monster thing is in the back of it.. please help

As for the 1st part, (rock climbing) I'd say "Cliff Hanger" with Sylverster Stallone.

As for the Monster at the end, that's the end of "Big Trouble in Little China" with Kurt Russell.

It actually Sounds like a lot of movies:

Vertical Limit
The Thing
Twilight Zone: The Movie

(I don't know if these help)

Hi Diex, its none of those, but ty so much for trying.. I've still never found out what the film is..