Ask him what his symptoms are, what he feels, what he wants to be medicated for. Ask him what level of medication he wants; what I mean is how much relief does he want from his symptoms. You could hypothetically keep him lit 24/7 on heady ass genetics, but that has some downfalls.
Are you going out on your own looking for a treatment for him? A noble cause, but probably misguided. If your in a state that doesnt have any sort of MMJ legislation, finding certain strains/genetics is going to be downright miserable.