Sadly, there isn't much you can do to help him. He has to want it, and he has to work it.
What you can actively do, is decide if you're willing to live that way, with him drinking and stealing pills - because if he decides not to work it, that's what you'll get. You know the drill from you Mother I'd guess.
Either way, Al-anon would be a great place for you to get support for you.