I disagree with:
Alcohol can affect your warfarin therapy, but you do not need to avoid alcohol altogether. We suggest that alcohol intake be limited to 1 drink per day (4 oz wine, 1.5 oz hard liquor, 12 oz beer). Do not drink more than usual. Serious problems may occur with alcohol and warfarin when you drink more than 2 drinks a day or when you change your usual drinking pattern. Be wary during special occasions or holidays – drink only what you usually do on any day of the week.
This is basically abstinence, considering that a drink before dinner, wine/beer with the meal, an aperitif and a nightcap were once considered a social norm.
I was told by the pharmacist who gave me warfarin education that drinking and warfarin is a problem if:
you puke out your warfarin,
forget to take your warfarin,
upset your stomach or intestines so much the warfarin isn't properly metabolized or
get drunk and hurt yourself and the additional bleeding due to warfarin makes a problem (e.g hit your head.)
I have been told by a cardiologist's nurse that drinking on warfarin is not recommended, however this was rescinded when I checked with her boss, my cardio. I've found over the years the anti-alcohol members of society like to push their agenda in new restrictions, from not allowing alcohol where it once was to recommending virtual abstinence whenever possible.