GHB
Gamma-Hydroxybutyric acid (GHB) is another name for the generic drug sodium oxybate. Xyrem® (which is sodium oxybate) is the trade name of the Food and Drug Administration (FDA)-approved prescription medication. Xyrem® is approved as a treatment to improve daytime sleepiness and muscle weakness with narcolepsy (a disorder marked by sudden, unexplained, spontaneous fatigue, napping, or falling asleep throughout the day).
 
Analogs that are often substituted for GHB include GBL (gamma butyrolactone) and 1,4 BD (also called just “BD”), which is 1,4-butanediol. These analogs are available legally as industrial solvents used to produce polyurethane, pesticides, elastic fibers, pharmaceuticals, coatings on metal or plastic, and other products. They are also sold illicitly as supplements for bodybuilding, fat loss, reversal of baldness, improved eyesight, and to combat aging, depression, drug addiction, and insomnia.