You know i envy him for having a caring friend like you ... but try to fix the original problem ... don't talk about the drinking issue or drugs now ... the drinking is just a consequence of his problem ... once you fix that problem ... el drinking will be fixed by itself ...
I know that you already know that especially when you said that you are worried about his health in the meanwhile and you are afraid that he might hurt himself if it took time ...
here his family has to play the major role ... depending on how much they care and how much they can influence on him ... if not la7 ykoun 7emel kbir 3alayke and you'll need some help from specialists if necessary
try step by step now ... it's really difficult situation
Thank You ...