Hi.... Consult a Psychiatrist. He may require a combination of medication and psychotherapy to overcome his addiction. Also, the way you have explained it, I believe he is suffering from a deep rooted complex and he might be deliberately trying to end his life by intoxication. I have observed such latent tendencies in cases of alcohol addiction. Please look for good De-addiction Centres near you.
Next Steps
Consult a Psychiatrist for Medication.
Consult a Psychologist for Counselling/Psychotherapy.
CBT along with Lifestyle Changes and Interpersonal Guidance and Counselling is required.
Health Tips
Mr. Gunjan Maithil
Senior Psychologist
Cell: nine six seven one three zero three one three four
Website: https://gunjanmaithil.wixsite.com/therapy
App: http://wix.to/fECHB08?ref=cl