My wife just started a new medication. One of the warnings on the label says to call your doctor right away if your skin turns blue.
Now for me, calling the doctor would be a given regardless of the warning label. I mean, if I woke up one morning and discovered that I looked like an extra for Avatar, I would assume that something is very very wrong.
But then again, I realize that not everyone is as intuitive as I am. I imagine that there are some people that would not think twice about the fact that they look like a Smurf. Of course, any one who would think that blue skin is normal probably would not read the warning label anyway.
Well, at least the drug manufacturer has covered themselves.