i.e. Gamma-hydroxybutyric-acid or sodium oxybate
GHB is a sedative hypnotic drug which also occurs naturally in the human central nervous system. It is used both medicinally and as a recreational drug. GHB is approved for clinical use in the US as a treatment for cataplexy associated with narcolepsy, and has been popularly termed "the date rape drug". It is sold under the trade name Xyrem.
GHB is a potent central nervous system depressant with hypnotic, amnestic, muscle relaxant, anticonvulsant, and anaesthetic properties.
It is an analogue of the inhibitory neurotransmitter GABA (chemically, gamma-aminobutyric-acid, and shares similar pharmacology. GHB acts as an agonist at the newly discovered GHB receptor, and a weak agonist at the inhibitory GABA-b receptor - The GABA-b receptor differs from the GABA-a subtype (a ligand gated ion channel), in that it is a G-protein coupled receptor.