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Created Aug 2020 | Updated Nov 2020


  • [ERIMIN]
  • [LAVOL]
  • [SUNIME]
  • [HAPPY 5]

DEA CODE 2837: Schedule 4

What is Erimin 5?
Erimin 5 is a street name for a drug called Nimetazepam, a type of Benzodiazepine manufactured in Sumitomo, Japan. It is an intermediate-acting hypnotic drug. It was first synthesized in 1962 by a team from Hoffman La Roche. Since early November 2015, it has ceased to be manufactured in Japan. It was prescribed for the short-term treatment of patients with severe insomnia, but in recent times, patients have been prescribed other hypnotics like Etizolam and Flunitrazepam to treat their illnesses due to the addictive and harmful consequences of Nimetazepam use. Erimin 5 is most popular in Singapore, Malaysia, and Indonesia. It is also known on the street as "Happy 5". The effects of Erimin 5 have a soothing effect on its user. Addicts do not have healthy coping mechanisms due to the nature of addiction. Erimin 5 sets off addiction in addicts because it feeds what is lacking in their brain: dopamine. It does so because the drug is a hypnotic, anxiolytic (it eradicates anxiety), sedative, musculoskeletal relaxant, as well as an anticonvulsant substance. Rarely do addicts use Erimin 5 by itself. It is used along with other drugs. Some users drink alcohol alongside taking Erimin 5. It is also a come down pill for Ecstasy (MDMA) and Methamphetamine users.

It is usually taken orally in tablet form. The fact that it is manufactured as a tablet of 5mg gives it the street names of Erimin 5 and Happy 5.

Nimetazepam 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.

Nimetazepam (Erimin) is an intermediate-acting hypnotic drug which is a benzodiazepine derivative. It was first synthesized in 1962 in Japan. It does possess hypnotic, anxiolytic, sedative, and skeletal muscle relaxant properties. Nimetazepam is also an anticonvulsant. It is sold in 5 mg tablets known as Erimin. It is generally prescribed for the treatment of short-term severe insomnia in patients who have difficulty falling asleep or maintaining sleep. Nimetazepam is currently a Schedule IV drug under the international Convention on Psychotropic Substances of 1971. In Singapore, nimetazepam is a class C drug under the Misuse of Drugs Act. In Hong Kong, nimetazepam is regulated under Schedule 1 of Hong Kong's Chapter 134 Dangerous Drugs Ordinance. Nimetazepam can only be used legally by health professionals and for university research purposes.

Effects & Dangers:

  • Loss of consciousness
  • Distorted judgment, sight and thinking
  • Difficulty in speaking, moving and co-ordinating bodily functions
  • Poor memory and concentration

Withdrawal Symptoms:

  • Anxiety and jittery feelings
  • Insomnia (difficulty in sleeping)
  • Nausea, vomiting, quickened heart beat, excessive sweating, violent shaking and stomach cramps
  • Mental confusion
  • Fits


A pharmaceutical benzodiazepine with hypnotic and sedative effects. Rarely seen in the West but reportedly very frequently abused in Malaysia.

RouteOnsetDurationAfter Effects
Tripsit Factsheets
All ROAs:15-30 minutes5-8 hours12-24 hours
Nimetazepam Duration
All other CNS depressants.
Anxiolytic, Sedative, Muscle Relaxant, Amnesia, Dystaxia, Hypnotic.

Caymanchem PDF Nimetazepam

Generally prescribed for the short-term treatment of severe insomnia in patients who have difficulty falling asleep or maintaining sleep. The sole global manufacturer of Nimetazepam (Sumitomo Japan) has ceased manufacturing Erimin since early November 2015. Taken orally, Nimetazepam has very good bioavailability with nearly 100% being absorbed from the gut. It is among the most rapidly absorbed and quickest acting oral benzodiazepines. There is a risk of misuse and dependence in both patients and non-medical users of Nimetazepam. The pharmacological properties of Nimetazepam such as high affinity binding, high potency, being short to intermediate - acting and having a rapid onset of action increase the abuse potential of Nimetazepam. The physical dependence and withdrawal syndrome of Nimetazepam also adds to the addictive nature of Nimetazepam. Nimetazepam has a particular reputation in South East Asia for recreational use, at around USD 7 per tab.

Two men charged with drug trafficking - were jointly charged with four counts of trafficking 413.826kg of nimetazepam at a house in Jalan Sri Klebang, Chemor on Aug 15. They were charged under Section 39B(1)(a) of the Dangerous Drugs ...
Thursday August 24, 2023 -

Cambodia arrests 3 foreigners for trafficking over 16-kg narcotics - PHNOM PENH, Feb. 25 (Xinhua) -- Cambodia has arrested a gang of three foreigners for possessing and trafficking illicit drugs, seizing over 16 kg of narcotics, the country's Anti-Drug Department (ADP) ...
Saturday February 24, 2024 -

Drug-laced lollipops on sale - “Party lollipops” or “drunk lollipops” are street names of this drug candy ... Service Institute found that one contained nimetazepam and tramadol, two of them contained ketamine and ...
Sunday February 04, 2024 -

Cambodian PM vows to fire armed forces, officials involved in drug cases - PHNOM PENH, Feb. 20 (Xinhua) -- Cambodian Prime Minister Hun Manet said on Tuesday that any armed forces or officials involved in drug cases will be fired and blacklisted from future jobs in the ...
Monday February 19, 2024 -

Mom and son among five charged for drug distribution - 0.59g of nimetazepam and 4.93g of cannabis. The first and second charges were framed under Section 12(2) of the Dangerous Drugs Act 1952, while the third charge was framed under Section 6 of the ...
Monday January 29, 2024 -

Parents in Thailand warned of recreational drugs sold as lollipops on social media - The drug candy goes by the street names of ... Narcotic Analysis and Technical Service Institute found one containing nimetazepam and tramadol, two containing ketamine and tramadol, and the ...
Sunday February 04, 2024 -

Cambodian PM vows to fire armed forces, officials involved in drug cases - Most of the confiscated drugs were heroin, ecstasy, ketamine, nimetazepam, cocaine, crystal methamphetamine, methamphetamine pills, and cathinone. The kingdom has no death sentence for illicit ...
Monday February 19, 2024 -

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