What would you say if he asked you to perform a medical operation on him, or prescribee drugs to him? Same difference here. You are not qualified to involve yourself in this. Maybe offer to go with him to the docs to find out what his options are. Point him in the direction of this place. Remind him that AA is available. But basically if he's not ready to take responsibility for his own recovery he's unlikely to stay sober anyway. Maybe his rock bottom will need to be a bit deeper.
BB