GBL (gamma-butyrolactone) and GHB (gamma-hydroxybutyrate) are chemically similar substances. GBL is a precursor of GHB and is converted to GHB in the body. Both are CNS depressants with sedative and euphoric effects (Alcohol and Drugs Action).

Both substances are usually taken orally. GHB is often available in a clear, odorless and almost tasteless liquid form. GBL is typically diluted with juice or other liquids due to its strong chemical taste.

Effects include euphoria, reduced inhibitions and drowsiness. At higher doses they can cause confusion, unconsciousness and respiratory depression. The effects can occur within 10-60 minutes and last up to seven hours (DrugFacts) (CADS Auckland).

Short-term effects include nausea, vomiting, memory loss and decreased heart rate. The risk of overdose is significant, especially when mixed with alcohol or other depressants, which can lead to coma or death. Long-term use can lead to dependence, withdrawal symptoms and serious health problems.

Due to their sedative properties and the fact that they are often colorless and tasteless, GBL and GHB have been used to facilitate sexual offenses by sedating victims without their knowledge.

Avoid taking it alone, always stay with friends and make sure someone knows what you have taken. Be careful about the source of the drug as the strength can vary. Never mix with alcohol or other sedatives as the risk of overdose is high.

If someone loses consciousness after taking GBL or GHB, it is important to call 911 immediately. Keep the person awake and in a safe position until help arrives.