Oh yes, he will need to work some kind of recovery program. His addiction will be screaming for the drugs. It's not easy but it's doable.
My Godchild was taking oxy's her last year of college, became an addict, worked an IOP, and has been clean from pills ever since. But she wasn't vigilant about her recovery after while and thought she could drink socially, but she learned quickly that she couldn't. She got a very good therapist (a recovering addict), has gone back to AA, made several changes in her life and has never been happier.