Gamma Hydroxybutyric Acid (GHB): There are three kinds of GHB abusers: those who take the drug to get high, those who use it in bodybuilding, and those who commit sexual assault after drugging their victims. GHB is also frequently used in combination with Ecstasy to counter over-stimulation. It is frequently taken with alcohol and is often found at bars, parties, nightclubs, raves and gyms.

GHB is often called the "date-rape" drug. Because of its effect on memory, GHB causes users to forget many details surrounding a sexual assault. GHB is quickly eliminated from a user's system, and it is sometimes hard to confirm its presence during rape investigations.

Effects 

Slurred speech, disorientation, drunken behavior without the odor of alcohol, impaired memory of events, interacts with alcohol.

Shallow respiration, clammy skin, dilated pupils, weak and rapid pulse, coma and possible death.

Street Names 

GHB, Georgia Home Boy, Grievous Bodily Harm, Liquid Ecstasy, Liquid X, Sodium Oxybate, Xyrem™

(Excerpts taken from justthinktwice.com)