Flubromazolam
Definition
A potent triazolo-benzodiazepine (active at 0.125-1 mg), not internationally scheduled, appearing in DFSA and overdose casework. Not cross-reactive with standard BZD immunoassays. Requires LC-MS/MS with updated inclusion list for detection.
- Class
- Triazolo-benzodiazepine, designer/novel psychoactive substance
- Active dose
- Approximately 0.125 to 1 mg
- Legal status
- Not internationally scheduled
- Immunoassay reactivity
- Not cross-reactive with standard benzodiazepine immunoassays
- Confirmatory method
- LC-MS/MS with an updated compound inclusion list
Common questions
Why does a negative benzodiazepine screen not rule out flubromazolam use?+
Standard immunoassay screens are designed around older, higher-dose benzodiazepines and use antibodies that do not bind flubromazolam well at its microgram-level active dose. A negative screen only means the tested antibody did not react, not that no benzodiazepine-class drug is present.
Why is flubromazolam particularly relevant to drug-facilitated sexual assault (DFSA) casework?+
Its potency means an incapacitating dose is extremely small, so it can be administered covertly and still cause profound sedation and memory loss. Because routine screens miss it, DFSA panels need to specifically target it with LC-MS/MS rather than relying on generic benzodiazepine assays.
Why does the lack of international scheduling matter for casework?+
Without a scheduling status in many jurisdictions, some laboratories do not include it on their default target compound lists at all, meaning it can be physically present in a sample yet never analytically tested for unless the panel is deliberately updated.
Related terms
- 7-Aminoflunitrazepam
- The primary urinary metabolite of flunitrazepam (Rohypnol), detected by LC-MS/MS in urine for up to 72 hours post-ingestion. The target analyte for...
- DFSA (Drug-Facilitated Sexual Assault)
- Sexual assault in which a substance is administered without the victim's consent to induce sedation, incapacitation, or amnesia. Most common substances in...
- Endogenous GHB Threshold
- Normal human blood GHB is 0.5-4 mg/L; urine 1-10 mg/L. Post-mortem fermentation can raise values to 20-50 mg/L. Forensic toxicologists typically use...
- Etizolam
- A thienodiazepine (thiophene ring instead of benzene ring fused to the diazepine) with GABA-A modulation pharmacology equivalent to classical benzodiazepines. Approved in...
- GABA-a Receptor
- The main inhibitory ligand-gated ion channel in the CNS; a pentameric alpha-beta-gamma subunit complex that opens its central chloride channel when GABA...
- 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...
- GHB (Gamma-Hydroxybutyric Acid)
- An endogenous GABA metabolite and short-chain fatty acid; exogenous doses of 1-3 g produce sedation, euphoria, and amnesia. Blood half-life ~20-30 min;...
- Phenobarbital
- A long-acting barbiturate (half-life 80-120 h) listed on the WHO Essential Medicines List as a first-line antiepileptic; Schedule IV under the UN...
- Positive Allosteric Modulation
- Mechanism by which benzodiazepines enhance GABA-A function: they increase the frequency of chloride channel opening in response to GABA without directly activating...