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Systematic (IUPAC) name
CAS number 2011-67-8
ATC code N05
PubChem 4496
DrugBank ?
Chemical data
Formula C16H13N3O3 
Mol. mass 295.3
Pharmacokinetic data
Bioavailability  ?
Metabolism Hepatic
Half life  ?
Excretion Renal
Therapeutic considerations
Pregnancy cat.


Legal status

Schedule IV(US)

Routes Oral

Nimetazepam (marketed under brand name Erimin®) is a hypnotic drug which is a benzodiazepine derivative. It possesses strong hypnotic, anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties. It is sold in 5 mg tablets known as Erimin-5. It is used to treat insomnia.

Nimetazepam has a reputation for being particularly subject to abuse (known as 'Happy 5', sold as an Ecstasy replacement without a hangover), especially by persons addicted to amphetamines or opiates. For this reason it is no longer sold in most Western nations, but is still a significant drug of abuse in some Asian countries such as Japan and Malaysia. Nimetazepam is the only benzodiazepine to be subject to legal restrictions in Malaysia, and due to its scarcity, many tablets sold on the black market are in fact counterfeits containing other benzodiazepines such as diazepam or nitrazepam instead.[1]

In a rat study Nimetazepam showed greater damage to the fetus, as did nitrazepam and especially temazepam when compared against other benzodiazepines. Diazepam however showed relatively weak fetal toxicities.[2]

See also


  1. ^
  2. ^ Saito H; Kobayashi H, Takeno S, Sakai T. (1984). "Fetal toxicity of benzodiazepines in rats.". Res Commun Chem Pathol Pharmacol. 46 (3): 437-47. PMID 6151222.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Nimetazepam". A list of authors is available in Wikipedia.
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