GHB, one of the date rape drugs. I'm sure they have a different classification, but in that group, it is also a depressant. It is used medically used to treat narcolepsy most commonly I think. I have had it slipped in my drink, the after effects were pretty harsh, obviously I have no way of knowing how much it was... quite a lot I would assume. I wouldn't think it's the safest thing to be taking.