I use to drink a glass of red wine a day and half a bottle on week ends.
For me nothing has changed. Alcohol makes me dizzy and more easy going after three glasses and continues to do so after rebooting finasteride.
However this is a very difficult field to study because one's reaction to alcohol is very very based on how you think you should feel. Once a research (I cannot link it now but seemed pretty obvious) showed that most people feel inebriated before alcohol has even entered the blood stream.