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Clonazolam

Clonazolam molecule structureClonazolam molecule structure

Clonazolam is a highly potent depressant of the triazolobenzodiazepine class1, structurally related to both clonazepam and alprazolam1. First synthesized in 1971, it was never marketed pharmaceutically1 and has been available as a research chemical since the mid-2000s. It is considered to pose higher risks than many other designer benzodiazepines due to its exceptional potencycitation needed, with strong sedation and amnesia reported at very low doses. Blackouts and dependence are frequently reported concerns.

Dosage & Duration

Dosage

Doses are population estimates that vary widely between individuals.

Threshold~50 µg
Light50-200 µg
Moderate200-400 µg
Strong400-500 µg
Heavy500+ µg

Extremely potent; doses as small as 0.5 mg can produce strong sedation and amnesia, and doses above 0.5 mg can cause benzodiazepine overdose in some individuals. Onset may be delayed, with some users feeling little or nothing until 1-2 hours after administration; redosing is inadvisable at any point. Vendors often sell 500 µg products despite this exceeding a common dose.

Duration

Onset10-30 minutes
After Effects1-12 hours
Total6-10 hours

Subjective Effects

Legacy content. A statistically backed ontology from Mindstate Design Labs is coming soon.

Effects vary widely by individual, dose, and context.

Physical

The physical effects of clonazolam can be broken down into several components which progressively intensify proportional to dosage.

Cognitive

The cognitive effects of clonazolam can be broken down into several components which progressively intensify proportional to dosage. The general head space of clonazolam is described by many as one of intense sedation and decreased inhibition. It contains a large number of typical depressant cognitive effects. Paradoxical reactions to benzodiazepines such as increased seizures (in epileptics), aggression, increased anxiety, violent behavior, loss of impulse control, irritability and suicidal behavior sometimes occur (although they are rare in the general population, with an incidence rate below 1%). These paradoxical effects occur with greater frequency in recreational abusers, individuals with mental disorders, children, and patients on high-dosage regimes.

Forked from Subjective Effect Documentation byJosie Kins September 2015.

Reagent Testing

Expected colorimetric results for common reagent tests. Colors show reaction change over 1–2 minutes.

Zimm(ZI)
white → blue2 → purple2
Marquis(MQ)
No reaction
No reaction
Mecke(ME)
No reaction
No reaction
Mandelin(MD)
No reaction
No reaction
Powered by PROtestkit.eu

Pharmacology

Pharmacodynamics

Clonazolam acts as a positive allosteric modulator of GABA-A receptors at the benzodiazepine binding site, enhancing the activity of the inhibitory neurotransmitter GABA.citation needed It is notably potent, proving the most active compound in a series of triazolobenzodiazepines and sometimes effective at doses below 10 μg/kg in mice.1 The anticonvulsant properties of benzodiazepines may also involve binding to voltage-dependent sodium channels.2

Pharmacokinetics

Clonazolam undergoes extensive metabolism in humans.3 The primary metabolic routes include reduction of the nitro groupcitation needed to form 7-aminoclonazolam (the most abundant urinary metabolite)3, which is subsequently acetylatedcitation needed to 7-acetaminoclonazolam. Monohydroxylation also occurs4, most likely at the α- and 4-positions, yielding hydroxyclonazolamcitation needed. These metabolites are further conjugated with glucuronic acid.

Interactions

Interactions not written up yet

An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.

Check TripSit

Tolerance

Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.

Full Tolerance
Tolerance to sedative-hypnotic effects can emerge quickly, often after only several days of uninterrupted use. Higher doses accelerate tolerance development, and tolerance may build at different rates for different effects--mood elevation tends to decline faster than sedation.
Cross Tolerance

Benzodiazepines

Baseline Reset
Following cessation, tolerance generally returns to baseline within 7-14 days. However, this timeframe may be significantly longer in cases of prolonged or intensive use, with the duration proportional to the intensity and length of prior consumption.

Harm Potential

Addiction & Dependence

Psychological

Extremely High

Clonazolam is considered extremely psychologically addictive with high abuse potential. Compulsive redosing is commonly reported, and the substance is noted for producing euphoria more frequently than many other benzodiazepines, which may increase its reinforcing properties. Rebound anxiety following use can facilitate cycles of dependence.

Physical

Extremely High

Physical dependence can develop within days of regular use, and in some cases even after a single large dose. Withdrawal is potentially life-threatening and may include anxiety, insomnia, cognitive impairment, elevated blood pressure, increased heart rate, tremor, restlessness, and in severe cases psychosis and seizures. Abrupt discontinuation is strongly discouraged; gradual tapering under medical supervision is recommended.

Psychosis Risk

Psychosis is rare during intoxication but may occur during severe benzodiazepine withdrawal. Paradoxical reactions including aggression, violent behavior, and increased anxiety occur with an incidence below 1% in the general population but are more frequent in recreational abusers, individuals with mental disorders, and those on high-dose regimens.

Seizure Risk

Clonazolam possesses anticonvulsant properties during active use.1 However, abrupt discontinuation after regular use poses a significant seizure risk that can be life-threatening. Gradual tapering is essential for anyone who has developed physical dependence.

History & Culture

Clonazolam was first synthesized in 19711 by The Upjohn Company, the pharmaceutical corporation that would later bring alprazolam (Xanax) to market. In the original research, the compound was described as the most active substance in the series of

Legality

International

Clonazolam is internationally placed in Schedule IV of the Convention on Psychotropic Substances of 1971. This international result does not itself establish each domestic implementation result above.

By Country

Illegal11
United States flagUnited StatesIllegal
Czech Republic flagCzech RepublicIllegal
Denmark flagDenmarkIllegal
Ireland flagIrelandIllegal
Italy flagItalyIllegal
Japan flagJapanIllegal
Netherlands flagNetherlandsIllegal
Philippines flagPhilippinesIllegal
Russia flagRussiaIllegal
Sweden flagSwedenIllegal
United Kingdom flagUnited KingdomIllegal
Controlled / restricted11
Australia flagAustraliaRestricted
Austria flagAustriaRestricted
Brazil flagBrazilRestricted
Canada flagCanadaRestricted
Germany flagGermanyRestricted
Poland flagPolandRestricted
Portugal flagPortugalRestricted
Singapore flagSingaporeRestricted
South Korea flagSouth KoreaRestricted
Spain flagSpainRestricted
Switzerland flagSwitzerlandRestricted

References

Citations

  1. World Health Organization Expert Committee on Drug Dependence. (2020). Critical Review Report: Clonazolam. World Health Organization. https://cdn.who.int/media/docs/default-source/controlled-substances/43rd-ecdd/final-clonazolam-a.pdf123456789101112
  2. McLean MJ, & Macdonald RL. (1988). Benzodiazepines, but not beta carbolines, limit high frequency repetitive firing of action potentials of spinal cord neurons in cell culture. The Journal of Pharmacology and Experimental Therapeutics, 244(2), 789-795. https://pubmed.ncbi.nlm.nih.gov/2450203/1
  3. Meyer MR, Bergstrand MP, Helander A, & Beck O. (2016). Identification of main human urinary metabolites of the designer nitrobenzodiazepines clonazolam, meclonazepam, and nifoxipam by nano-liquid chromatography-high-resolution mass spectrometry for drug testing purposes. Analytical and Bioanalytical Chemistry, 408(13), 3571-3591. https://doi.org/10.1007/s00216-016-9439-612
  4. Moosmann B, Huppertz LM, Hutter M, Buchwald A, & Auwärter V. (2015). Characterization of the four designer benzodiazepines clonazolam, deschloroetizolam, flubromazolam, and meclonazepam, and identification of their in vitro metabolites. Forensic Toxicology, 33(2), 388-395. https://doi.org/10.1007/s11419-015-0277-61
  5. Pietro Brunetti, Raffaele Giorgetti, Adriano Tagliabracci, Marilyn A. Huestis, & Francesco Paolo Busardò. (2021-06-11). Designer Benzodiazepines: A Review of Toxicology and Public Health Risks. Pharmaceuticals. https://doi.org/10.3390/ph140605601
  6. Office of Drug Control controlled-substances entry (Commonwealth import/export controls). odc.gov.au (n.d.). https://www.odc.gov.au/controlled-substances/list/clonazolam1
  7. Psychotropenverordnung (PV), Anlage 1, Z 2; §§ 1–2. ris.bka.gv.at (n.d.). https://ris.bka.gv.at/GeltendeFassung.wxe?Abfrage=Bundesnormen&Gesetzesnummer=100110541
  8. Psychotropenverordnung (PV), Anlage 1, Z 2; §§ 1–2. ris.bka.gv.at (n.d.). https://ris.bka.gv.at/NormDokument.wxe?Abfrage=Bundesnormen&Anlage=1&Artikel=&FassungVom=2026-02-03&Gesetzesnummer=10011054&Paragraf=&Uebergangsrecht=1
  9. Portaria SVS/MS nº 344/1998, Anexo I, Lista B1, as updated by RDC Anvisa nº 581/2021. gov.br (n.d.). https://www.gov.br/anvisa/pt-br/assuntos/medicamentos/controlados/lista-substancias1
  10. Portaria SVS/MS nº 344/1998, Anexo I, Lista B1, as updated by RDC Anvisa nº 581/2021. gov.br (n.d.). https://www.gov.br/anvisa/pt-br/assuntos/medicamentos/controlados/arquivos/copy_of_rdc581.pdf1

Article Status

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    Step 1 · Automated synthesis

    An autonomous workflow built by Josie Kins compiled this article's foundation from information published across the web.

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    Not yet reviewed — this article is pending editorial review by Lyrea.

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    No one has reviewed this article's citations yet. That second pass checks each claim against the source it cites.

Recent changes7 human edits · latest

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24 January 2026

  1. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  2. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  3. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  4. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  5. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  6. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

  7. Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more

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