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GHB / GBL + Benzodiazepines

We recommend avoiding this combination. No numeric safety recommendation possible.

review pending

Content is undergoing medical and legal review. Changes possible.

Substances involved

Risk profile

Double GABAergic depression with massive respiratory depression. Benzodiazepines extend GHB's effect and mask early warning signs. Sedation can progress into respiratory arrest without the person appearing physically conspicuous.

Acute emergency scenarios

Benzodiazepines (alprazolam, diazepam, lorazepam, etizolam, designer benzos) act on the GABA-A receptor and potentiate the effect of GHB. Unlike the GHB + alcohol combination, this one adds a prolonged duration of effect — benzos last a long time.

Clinically documented consequences:

  • Prolonged unconsciousness, hard to wake up
  • Respiratory depression with delayed onset (hours after taking it)
  • Aspiration pneumonia from vomiting while asleep

Emergency treatment: securing the airway. Flumazenil (a benzo antagonist) can reverse the benzo component, but it is contraindicated with chronic benzo use (seizure risk) and ineffective against GHB — a job for emergency physicians.

Designer benzos in the current market (e.g. bromazolam, flubromazolam) are especially risky because their potency and duration are hard to gauge.

We recommend avoiding this combination.