Phenibut is quite interesting. Some people feel "drunk" at higher dosages, a lot of people use it at lower dosages for feelings of well being and for an anti-anxiety effect. Starting out, I would go with 500mg's first to assess tolerance. You could go up to a gram and see how you feel after that. It's a toss up with dosages, as it definitely varies for a lot of people. Start it low though, as it hits some people "hard", and can give a nasty hangover as well. I am a big fan of it, just don't overuse it.