DO NOT let him take suboxon. The addiction is far worse than the vikes. I know from experience. Go it cold turkey it's the only way. It takes a couple of months to get back to 100% normal but it's worth it.
You need to go to www.suboxone.com. Also check out naabt.com (or it is nabbt.com). That is exactly what I did and found a doc that prescribes suboxone in my area.
It is great but it isn't for everyone and he has to be ready to quit. If he isn't quitting for the right reasons nothing will help. I know because I tried to quit 4x and now I feel finally ready.
I am going to quote what someone said here that I thought spelled it out. "I know I have another relapse in me but I don't have another recovery". What that means is quitting is hell and everytime you quit and try to get clean it gets harder and harder. I hope your boyfriend is ready to quit.
Some people quit for family, some quit to avoid jail, some quit for work. But you can only heal when you do it for yourself.