How can i help my brother get rid of his addiction ?

You can't: Only he can help himself, but there are things you can do that first of all help yourself (and others in your family), and may ultimately help him. Family members often "enable" addiction, allowing the person to get away with behaviors that are unacceptable. See a family therapist with your brother if he accepts, without him if he doesnt. Find a good alanon meeting in your area. Talk 2 ur doctor.