My father in law is an alcoholic who has Atrial Fibrillation and is on coumadin. His cardiologist will not perform a cardioversion for him until his INR is within an acceptable level but it never is! The coumadin nurses frequently tell him his levels are too high and tell him to not take any coumadin for days at a time then the cardiologist tells him his INR is top low and they post pone the cardioversion. How much can he drink on a daily basis, I know if he has a alcohol limit he will stick to it because he is so short of breath that he is miserable being in AFib. Please advise, he is 82 and I have told him not to drink at all but he gets depressed because he can not do anything without being short of breath then he drinks.