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Systematic (IUPAC) name
Clinical data
  • US: X (Contraindicated)
Routes of
Oral, Intravenous
Legal status
Legal status
Pharmacokinetic data
Bioavailability 80-90%
Metabolism Hepatic
Biological half-life 60-90 hours
Excretion Renal
CAS Number 25967-29-7
ATC code none
PubChem CID 3400
Chemical data
Formula C19H16ClFN2O
Molar mass 342.795[[Script error: No such module "String".]]
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Flutoprazepam (Restas, KB-509) is a drug which is a benzodiazepine derivative. It was invented in Japan in 1972, and its medical use remains mostly confined to that country. Its muscle relaxant properties are approximately equivalent to those of diazepam - however, it has more powerful sedative, hypnotic, anxiolytic and anticonvulsant effects and is around four times more potent by weight compared to diazepam. [1] It is longer acting than diazepam due to its long-acting active metabolites,[2] which contribute significantly to its effects.[3]

Flutoprazepam is typically used for the treatment of severe insomnia and may also be used for treating stomach ulcers.[4]

Abuse of benzodiazepines in Japan is extremely common, with flutoprazepam being one of the most commonly abused, along with the benzodiazepines of abuse nimetazepam, temazepam and triazolam.

Flutoprazepam is currently a Schedule IV drug under the international Convention on Psychotropic Substances of 1971.[5][6]

In Singapore, flutoprazepam is a Class C-Schedule II drug under the Misuse of Drugs Act.

In Hong Kong, flutoprazepam is regulated under Schedule 2 of Hong Kong's Chapter 134 Dangerous Drugs Ordinance. Flutoprazepam may be prescribed for the treatment of insomnia by a registered medical doctor. The penalty for trafficking or manufacturing the substance is a $100,000 (HKD) fine and possibly a short imprisonment (1-2 years). Possession of the substance for consumption without valid prescription from a registered medical doctor is illegal and punishable with a $50,000 (HKD) fine.[7]

See also


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  3. Barzaghi, N.; Leone, L.; Monteleone, M.; Tomasini, G.; Perucca, E. (1989). "Pharmacokinetics of flutoprazepam, a novel benzodiazepine drug, in normal subjects". Eur J Drug Metab Pharmacokinet. 14 (4): 293–8. doi:10.1007/BF03190114. PMID 2633923. 
  4. Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
  5. http://www.cnb.gov.sg/ [Central Narcotics Bureau, Singapore]
  6. "Green List—List of psychotropic substances under international control" (PDF). International Narcotics Control Board. 23rd edition, August 2003. Retrieved 2007-11-25.  Check date values in: |date= (help)
  7. "Bilingual Laws Information System" (English). The Government of the Hong Kong Special Administrative Region of the People's Republic of China.