I started a thread called "alcohol is a biatch if u wanna gain weight" or something ;-)...Ive made the experience that drinking definetly hurts my muscle gains. It has not just an indirect effect (as in having a hang over and thus no energy) but it has also bad effects on your muscles directly. it reduces your testosterone leveles for example (I know this sounds like its not that important but drinking alcohol really reduced my gains). I like to enjoy myself too though, so if I go out 2 times on the weekend I just get a little tipsy and if I go out once I might get kinda drunk ;-) Im not staying away from it completely but drink in moderation..and reducing my alcohol consumption has definetly helped me.
For example there was a time (after I graduated) of about 4 months when I got pretty drunk like 3 days a week and I wasnt able to increase my lifts at all during this time. Then I slowed down on drinking..drinkin in moderation like 1 or 2 times a week (and not getting hammered) and all of a sudden my lifts started to go up again. On the other hand theres gonna be 3 hot parties from friday to monday where I definetly have to go, which kinda bothers me cause I know this will most likely mean that I wont be able to up my lifts during that time
So Im just not gonna drink on the following weekend (= almost 2 weeks of not drinking) and concentrate on getting my lifts up, and its gonna be aight ;-).
Basically I would say only drink when ure going to a party or something (give up the beers ure drinking during the week while ure in front of the TV ;-)), try to not get hammered, except for once in a while if u want to and only drink as much as u need to party dont drink for the sake of doing it. If ure not trainign to become a professional bodybuilder and your life doesnt revolve around bodybuilding but u just wanna get strong and have a nice physique thatll attract the ladies, I think youll be fine with drinking in moderation if your workout / nutrition is right.