GHB
Product: Gamma-hydroxybutyrate (GHB).
Street names: Fantasy, grievous bodily harm (GBH), liquid ecstasy, liquid E, G.
Symptoms: Drowsiness, induced sleep, nausea, reduced inhibitions, dizziness, headache, increased sociability, initial euphoria leading to confusion and agitation.
Potential problems: Extreme drowsiness, loss of consciousness, hallucinations, difficulty focussing eyes, vomiting, impaired movement and speech, reduces muscle tone, disorientation, convulsions/seizures, coma, respiratory distress, slowed heart rate, lowered blood pressure, amnesia, death. Can be addictive with prolonged use.
Source - http://www.drugs.health.gov.au