Hi, is his social, personal or occupational life disturbed due to his excessive drinking? Does he do it daily? If yes to both the questions then there is a good chance he is suffering from addiction to alcohol. In such cases you need to visit psychiatrists or take him to rehabilitation center (if available in your city) as medications and counseling both need to be administered for bringing a change in his behaviour. Sadly, there are no effective home remedies for a long term cure. You will need to get professional help asap and a different environment where alcohol won't be available at all and such an environment can be found only in rehabs. You could also try looking for group counseling in your city as they are considered to be effective as well.