Psychedelic Research Chemicals or RC Chems are new synthetic substances which are structurally similar to the original drug, while being functional analogs. Data on their effects limited due as they’re fairly new and do not have a lot of human consumption history.

Psychedelics are substances (natural or laboratory made) which cause profound changes in a one’s perceptions of reality. While under the influence of hallucinogens, users might hallcuniate visually and auditorily.

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25B-NBOMe Also known as:

  • 2-(4-Brom-2,5-dimethoxyphenyl)-N-(2-methoxybenzyl)ethanamin[German][ACD/IUPAC Name]
  • 2-(4-Bromo-2,5-dimethoxyphenyl)-N-(2-methoxybenzyl)ethanamine[ACD/IUPAC Name]
  • 2-(4-Bromo-2,5-diméthoxyphényl)-N-(2-méthoxybenzyl)éthanamine[French][ACD/IUPAC Name]
  • Benzeneethanamine, 4-bromo-2,5-dimethoxy-N-[(2-methoxyphenyl)methyl]-[ACD/Index Name]
  • Cimbi-36
  • S6NAA81PHK
  • 2-(4-bromo-2,5-dimethoxy-phenyl)ethyl-(2-methoxybenzyl)amine
  • 2-(4-bromo-2,5-dimethoxyphenyl)-N-[(2-methoxyphenyl)methyl]ethanamine
  • 2-(4-bromo-2,5-dimethoxy-phenyl)-N-[(2-methoxyphenyl)methyl]ethanamine
  • 25B
  • 25Br-NBOMe
  • 2C-B-NBOMe
  • 4-Bromo-2,5-dimethoxy-N-[(2-methoxyphenyl)methyl]benzeneethanamine

Psychedelic Phenethylamine, active in the lower microgram range, that is not active orally.


It is a member of the 25x-NBOMe series, a recently discovered group of potent psychedelic compounds derived from the 2C-x family. The name 25B-NBOMe, which is short-hand for 2C-B-NBOMe, indicates it is a derivative of the phenethylamine psychedelic 2C-B. 25B-NBOMe was discovered in 2004 by Ralf Heim at the Free University of Berlin.

It acts as a potent partial agonist for the 5-HT2A receptor. It has been used in clinical trials with an evaluation dose for safety consideration to humans of only 1 microgram. Such a dose was determined to be only 1/300th the dose expected to be hallucinogenic to humans and that recreational use would greatly exceed doses determined to be safe to humans.

This substance had no history of human use before being sold online as a designer drug in 2010. Subjective effects include stimulation, open and closed-eye visuals, time distortion, euphoria, and ego loss. Anecdotal reports suggest 25B-NBOMe to be an active hallucinogen at a dose of as little as 250–500 µg, making it a similar potency to other phenethylamine derived hallucinogens such as Bromo-DragonFLY.

It is worth noting that compounds of the NBOMe class are not orally active and should therefore be taken sublingually by placing them into one’s mouth and allowing it to absorb over a period of 15-30 minutes. Extremely little is known about the pharmacological properties, metabolism, and toxicity of 25B-NBOMe in humans. Numerous members of the 25x-NBOMe series have been associated with hospitalizations and deaths.

Along with its highly sensitive dose-response and unpredictable effects, many reports also suggest that this substance may be overly difficult to use safely. Therefore it is highly advised to use harm reduction practices if using this substance.




25B-NBOMe is a substituted phenethylamine with methoxy groups CH3O- attached to carbons R2 and R5 as well as a bromine atom attached to carbon R4.

It differs from 2C-B structurally through a substitution on the amine (NH2) with a 2-methoxybenzyl (BOMe) group.

25B-NBOMe shares this 2-methoxybenzyl substitution with other chemicals of the NBOMe family.

This NBOMe addition contains a methoxy ether CH3O- bound to a benzene ring at R2.

Common Name25B-NBOMe
Systematic name25B-NBOMe
Std. InChiInChI=1S/C18H22BrNO3/c1-21-16-7-5-4-6-14(16)12-20-9-8-13-10-18(23-3)15(19)11-17(13)22-2/h4-7,10-11,20H,8-9,12H2,1-3H3
Avg. Mass380.2762 Da
Molecular Weight380.2762
Monoisotopic Mass379.078308 Da
Nominal Mass379
ChemSpider ID8152636

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Dose Chart


Duration Chart

Onset20-40 minutes
Duration8-12 hours
After-effects2-6 hours

Auditory Effects

Psychological Effects

Pharmacological Effects

25B-NBOMe has efficacy at the 5-HT2A receptor where it acts as a potent partial agonist. However, the role of these interactions and how they result in the psychedelic experience continues to remain elusive.

Physical Effects

  • Stimulation - In terms of its effects on the physical energy levels of the user, 25B-NBOMe is usually considered to be energetic and stimulating, but it can be considered less stimulating when compared to 25I-NBOMe. For most people, this substance induces a unique type of physical stimulation which can be described as feeling extremely energetic but in a way which does not force the person to move unless they genuinely choose to do so. For others, however, the stimulation can be quite uncontrollable, occasionally resulting in bodily shakes and a grinding of the teeth comparable to that of MDMA and traditional stimulants such as amphetamine, but this is manifested much less consistently when compared to that of 25I-NBOMe
  • Mouth numbing - Assuming the substance has been taken sublingually, the very first physical effect which a person will notice immediately after sublingual absorption is a strong, unpleasant metallic chemical taste. This is accompanied by a very obvious feeling of general numbness of the tongue and mouth which can stay for up to an hour after the blotter paper has been consumed. This is a key difference when it comes to determining whether one's blotter paper contains LSD or one of the NBOMe series.
  • Spontaneous physical sensations - The "body high" itself can be described as a generally mild, all-encompassing, soft but euphoric tingling sensation. This tingling sensation is also accompanied by spontaneous rushes of euphoria that become longer and more drawn out proportional to the dosage consumed.
  • Perception of bodily lightness - In terms of the body’s perceived weight, this substance consistently leaves people feeling extremely light, often to the point of total weightlessness.
  • Nausea - As the user begins to come up, nausea is not uncommon and can sometimes result in initial vomiting, but passes once this has either happened or the trip begins to fully set in. In comparison to other psychedelics such as psilocin, LSD, 2C-E and 2C-I, this could actually be very considered very mild in its intensity.
  • Vasoconstriction
  • Increased heart rate
  • Pupil dilation

Subjective Effects

Disclaimer: The effects listed below are cited from the Subjective Effect Index (SEI), which relies on assorted anecdotal reports and the personal experiences of PsychonautWiki contributors. As a result, they should be taken with a healthy amount of skepticism. It is worth noting that these effects will not necessarily occur in a consistent or reliable manner, although higher doses (common+) are more likely to induce the full spectrum of reported effects. Likewise, adverse effects become much more likely on higher doses and may include serious injury or death.

Visual Effects




The visual geometry that is present throughout this trip is often described as similar in appearance to that of LSD. They can be comprehensively described as algorithmic in geometric style, intricate in complexity, fine and zoomed out in detail, fast and smooth in motion, structured in shape, colourful in scheme, glossy in colour, sharp around the edges and mostly rounded across their corners. In comparison to other more commonly used psychedelics they can be described as significantly more intricate than the visual geometry found within 2C-I and most of the 2C-x family in general as well as completely on par with LSD, psilocin and DMT at appropriately high dosages.

In terms of their behaviour, 25B-NBOMe’s geometry leads onto Level 8A visual geometry with Level 8B remaining so far unconfirmed within this substance. They also seem to consistently build up in visual intensity when the user stares at a central point. This eventually envelops the visual field and creates the sensation that the user has broken through into a continuously shifting geometric landscape or structure with a vast sense of immersive physical size attributed to it.

Hallucinatory states

Legal Status

  • Austria: Since June 26, 2019, 25B-NBOMe is illegal to possess, produce and sell under the SMG. (Suchtmittelgesetz Österreich)
  • Brazil: Possession, production and sale is illegal as it is listed on Portaria SVS/MS nº 344.
  • Canada: 25B-NBOMe would be considered Schedule III as it is a derivative of 2,5-dimethoxyphenethylamine.
  • China: As of October 2015, 25B-NBOMe is a controlled substance in China.
  • Germany: 25B-NBOMe is controlled under Anlage I BtMG (Narcotics Act, Schedule I) as of December 13, 2014. It is illegal to manufacture, possess, import, export, buy, sell, procure or dispense it without a license.
  • Italy: 25B-NBOMe is a Schedule 1 controlled substance in Italy.
  • Latvia: 25B-NBOMe is a Schedule I controlled substance.
  • New Zealand: 25B-NBOMe is a Schedule 2 controlled substance in New Zealand.
  • Sweden: 25B-NBOMe is classed as Schedule I.
  • United Kingdom: 25B-NBOMe is a Class A drug in the United Kingdom as a result of the N-benzylphenethylamine catch-all clause.
  • United States: On Nov 15, 2013, the DEA added 25B-NBOMe to Schedule I using their emergency scheduling powers, making it "temporarily" in Schedule I for 2 years.
  • Sources


    1. Other or Unknown NBOMe Compound Fatalities / Deaths by Erowid |
    2. Ralf Heim (February 28, 2010). "Synthese und Pharmakologie potenter 5-HT2A-Rezeptoragonisten mit N-2-Methoxybenzyl-Partialstruktur. Entwicklung eines neuen Struktur-Wirkungskonzepts." (in German). Retrieved 2013-05-10.
    3. Hansen, M.; Phonekeo, K.; Paine, J. S.; Leth-Petersen, S.; Begtrup, M.; Bräuner-Osborne, H.; Kristensen, J. L. (2014). "Synthesis and Structure-Activity Relationships of N-Benzyl Phenethylamines as 5-HT2A/2C Agonists". ACS Chemical Neuroscience. 5 (3): 243–9. PMID 24397362.
    4. Bromo-Dragonfly Dosage by Erowid |
    5. Synthesis and pharmacology of potent 5-HT 2A receptor agonists with N-2-methoxybenzyl partial structure |
    6. Theoretical study of the interaction of agonists with the 5-HT2A receptor |
    7. Theoretical studies on the interaction of partial agonists with the 5-HT2A receptor |
    8. Synthesis and Structure–Activity Relationships of N-Benzyl Phenethylamines as 5-HT2A/2C Agonists |
    9. Designer Drug Identified As Cause Of Plano Teen’s Death |
    11. Preclinical Safety Assessment of the 5-HT2A Receptor Agonist PET Radioligand [11C]Cimbi-36 |
    20. Controlled Drugs and Substances Act (S.C. 1996, c. 19) |
    21. 关于印发《非药用类麻醉药品和精神药品列管办法》的通知 |
    22. "Achtundzwanzigste Verordnung zur Änderung betäubungsmittelrechtlicher Vorschriften" (PDF) (in German). Bundesanzeiger Verlag. Retrieved December 11, 2019.
    23. "Anlage I BtMG" (in German). Bundesministerium der Justiz und für Verbraucherschutz. Retrieved December 11, 2019.
    24. "§ 29 BtMG" (in German). Bundesministerium der Justiz und für Verbraucherschutz. Retrieved December 11, 2019.
    25. Tabella 1 Stupefacenti dello Stato Italiano |
    26. Noteikumi par Latvijā kontrolējamajām narkotiskajām vielām, psihotropajām vielām un prekursoriem (2,5-Dimetoksifeniletānamīni) |
    28. Läkemedelsverkets författningssamling -
    29. United Kingdom. (2014). Misuse of Drugs Act 1971 (S.I. 2014/1106). London: The Stationery Office Limited. Retrieved July 5, 2017, from

    Information made possible with:

    1. PsychonautWiki is a community-driven online encyclopedia that aims to document the field of psychonautics in a comprehensive, scientifically-grounded manner.
    2. Erowid is a non-profit educational & harm-reduction resource with 60 thousand pages of online information about psychoactive drugs
    3. PubChem National Center for Bio Informatics
    4. Chemspider is a free chemical structure database providing fast access to over 34 million structures, properties and associated information.
    5. Wikipedia

    Additional APIs were used to construct this information. Thanks to ChemSpider, NCBI, PubChem etc.

    Data is constantly updated so please check back later to see if there is any more available information on this substance.