As the voice of reason, this is a legal question, not a medical one. I don't have any laws open in front of me since I'm only willing to spend a couple minutes looking, but driving while impaired is a crime, equal with drunk driving. My guess is that if the label says that you should not drive, then you can't. Check out this website:
Drug Impaired Driving
And everyone, let's please take a deep breath and try to converse maturely. Please.