Further, unless you are not only a medical professional but also THIS PERSON's medical professional, you really don't know the reason for the medication.
Of course, if you WERE this person's doctor, you would be prohibited from discussing the case and treatment as well.
Now, for a visit from Unca Jeffy...
Just stop.
You start posting other folks intimate details, you can expect to be sued. You may or may not win the suit, but you will definitely find yourself on the wrong end of a large legal bill.
Why, if you wanted to warn someone, wouldn't you just call that person rather than posting such information on the internet... unless, of course, you WANTED the world to know.
See how this paints you?