well, the best way is to try it out- when you're drinking really heavy one night, use finasteride during your binge. If you wake up ok in the morning, then it's probably ok to combine the both. if you DON'T wake up in the morning, or ever wake up again for that matter, then i'd say it's not a good idea to combine them
WAIT! i'm kidding
i have not heard anything about combining the two, so it's probably ok to do so (and don't worry you most definitely WILL wake up in the morning- i can't guarantee how 'ok' you'll be though- that'll depend on how many you pound back the night before, lol)
BOOLEY