It is perfectly legal for a physician, once a med has been approved by the FDA, to
use it for
off-
label purposes. What isn't legal is for the manufacturer to talk the physician into using it for off-label purposes. So this med might be the best thing for you, and it might be completely inappropriate depending on where the professional got the info from. So you're right to question things, but as I said, that doesn't mean this isn't a good med for you.