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GBL (gamma-butyrolactone)

A prodrug of GHB spontaneously hydrolysed by blood paraoxonase-1 to GHB within minutes. An industrial solvent; scheduled as Class C in the UK since 2009. May be detected in blood drawn very shortly after ingestion before full conversion to GHB.

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7-AminoflunitrazepamDFSA (drug-facilitated sexual assault)Endogenous GHB thresholdEtizolamFlubromazolamGABA-A receptorGHB (gamma-hydroxybutyric acid)PhenobarbitalPositive allosteric modulation

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