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Flubromazepam

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Flubromazepam is a benzodiazepine-like drug that was first made in 1960 but never marketed. It reappeared around 2012 as a designer drug on the grey market. It is a fluorinated version of phenazepam, meaning a chlorine atom in phenazepam is replaced by fluorine. An isomer called iso-flubromazepam (5-(2-bromophenyl)-7-fluoro-1,3-dihydro-2H-1,4-benzodiazepin-2-one) may be sold under the same name.

Flubromazepam acts as a sedative like other benzodiazepines and has a very long duration of action, with an elimination half-life of about 106 hours.

Legal status (highlights):
- United Kingdom: Class C (as of May 2017)
- United States: Not federally scheduled; Virginia lists it as Schedule I
- Germany: Anlage II (authorized trade only, not prescribable)
- Canada: Schedule IV

Identifiers:
- IUPAC name: 7-Bromo-5-(2-fluorophenyl)-1,3-dihydro-1,4-benzodiazepin-2-one
- CAS number: 2647-50-9
- Molecular formula: C15H10BrFN2O
- Molecular mass: 333.16 g/mol


This page was last edited on 2 February 2026, at 10:14 (CET).