Bertie, do you have a brother or sister who could manage the money? If it's a significant amount, you can hire an attorney to take care of it...or a financial advisor.
I would NOT use the money as a bribe for taking medications. For one thing, there's no way you could police it because you live so far away. For another, you aren't doing him any favors---he needs to take medications because he WANTS to get better, not because something is being held over his head. 
Good luck!
Suz
