Hi Jessie,
My understanding is that it is OK to drink alcohol, but you should not drink excessively. I think the reasoning for this is that alcohol is processed by the liver, but if you overwhelm your liver it is then processed by your kidney (someone please correct me if I'm wrong on this).
Before donation I basically drank 1 to 5 drinks every evening. Right before donation, I switched to only drinking when my wife and I went out, or when we had company over. So, now I generally drink 1 to 2 drinks twice/week.
One thing I will tell you is I'm much more susceptible to hang-overs. Not sure why this is.
_kdub