Protip: NAC prevents hangovers. I take one before and one after if I'm expecting an epic night out. The downside is, I don't get drunk so all the drink spend is wasted money. The upside, I come across as impervious instead of naturally being the lightweight of the group. Very useful when hanging out with alcoholic salespeople if you need to work the next day.
Test it out before you need it because the taste/smell makes some people puke like crazy for half an hour...