6-APB
6-APB is a synthetic entactogen of the benzofuran class, structurally related to MDA.citation needed First synthesized in 1993 by David E. Nichols as a potential non-neurotoxic alternative to MDMA, it did not see recreational use until over a decade later, when it was briefly sold on the research chemical market under the name "Benzofury." Compared to MDMA, 6-APB is reported to produce stronger psychedelic and visual effects while retaining comparable entactogenic qualities. Wide variability in dose response has been noted.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
The potency by weight varies depending on the salt form, with hydrochloride, succinate, and fumarate preparations each requiring different amounts to achieve equivalent effects. This dosage table is applicable to 6-APB HCl.
Duration
Subjective Effects
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6-APB produces an entactogenic experience with stimulant and mild psychedelic qualities, frequently compared to MDMA and MDA. Relative to MDMA it tends to carry more visual effects and a stronger psychedelic character while being at least as entactogenic. The experience centers on mood lift, euphoria, empathy, and a pervasive sense of well-being and contentment, with a comfortable warmth that emerges within the first half hour and settles into a long, gentle plateau. At moderate doses users remain functional and able to concentrate, though a period of low mood and irritability lasting several days after use has been reported.
Physical
A pleasant body warmth and a dreamy, heady bliss characterize the physical experience, accompanied by mild stimulation. Sweating, slight increases in heart rate and blood pressure, jaw tension, tremors, nausea, and alternating sensations of cold or shivering are among the reported side effects.
Bodily
Stimulation
Stimulation is present but gentle at moderate doses, leaving users functional and able to focus on tasks.
Cognitive
The headspace combines euphoria, enhanced empathy, and a strong sense that all is well, alongside increases in associative and creative thinking and awareness. Perception of time can shift, and anxiety or confusion occur in some users; overdoses may feature paranoia and agitation.
Emotional
The emotional tone is warm and positive — a gentle, flowing contentment and mood lift with a distinct empathogenic edge.
Visual
Visual effects are light to moderate for most users, described as organic and cartoon-like, with both closed- and open-eye components. 6-APB is generally regarded as more visual than MDMA.
Auditory
Music appreciation is notably increased.
Tactile
See also: Psychedelic Intensity Scale, Effects of psychedelics (visual, cognitive, miscellaneous)
Pharmacology
Pharmacodynamics
6-APB acts as a serotonin, norepinephrine, and dopamine releasing agent and reuptake inhibitor, with EC50 values for monoamine release of 10 nM (dopamine), 14 nM (norepinephrine), and 36 nM (serotonin) in rat brain synaptosomes.1 Its highest-affinity binding target is the serotonin 5-HT2B receptor (Ki = 3.7 nM),citation needed for which it shows approximately 100-fold selectivity over the 5-HT2A and 5-HT2C receptors; it has been characterized as either a high-efficacy partial agonist or full agonist at this site (Emax = 70%). 6-APB also displays partial agonism at the 5-HT2A receptor and agonist activity at the 5-HT2C receptor at considerably lower potencies, and binds with high affinity to the α2C-adrenergic receptor (Ki = 45 nM), though the functional significance of this binding in humans is unknown.
Pharmacokinetics
Available metabolic data, derived from rat studies, indicates that 6-APB undergoes Phase I metabolism involving hydroxylation and cleavage of the furan ring, followed by reduction of the resulting unsaturated aldehyde.2 This intermediate is then either oxidized to a carboxylic acid or reduced to an alcohol and subsequently hydroxylated. Phase II metabolism proceeds via glucuronidation.2
Dangerous
Highest riskThese combinations are considered extremely harmful and should always be avoided. Reactions to these drugs taken in combination are highly unpredictable and have a potential to cause death.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
Dopaminergic stimulants
Harm Potential
Addiction & Dependence
Psychological
ModerateModerately addictive with high potential for abuse, capable of causing psychological dependence in some users. Compulsive redosing can occur due to euphoric effects, though this urge is often reported as less pressing than with MDMA due to the longer duration.citation needed
Physical
LowCravings and withdrawal effects may occur when chronic use is suddenly stopped. After-effects including depression, irritability, and cognitive fatigue for several days following use are commonly reported, attributed to neurotransmitter depletion rather than true physical dependence.
Toxicity
Long-term or chronic use involving regular daily or weekly dosing is likely cardiotoxic and may lead to valvulopathy; occasional recreational use at typical doses carries significantly lower risk.
Repeated or high-dose administration may result in neurotoxicity presenting as deficits in cognitive, affective, and psychomotor function, though 6-APB was specifically designed to be less neurotoxic than MDA or MDMA and single responsible uses are likely physically safe.
Psychosis Risk
Acute psychosis has been reported in combination with synthetic cannabinoids.3 Delusions are listed among possible cognitive effects, typically at higher doses or during the offset phase of the experience.
Seizure Risk
Rare effect primarily occurring in predisposed individuals, particularly when taking high doses or redosing while dehydrated, fatigued, undernourished, or overheated.
History & Culture
Discovery and Scientific Development
The benzofuran entactogens emerged from academic research into the structure-activity relationships of MDMA and related compounds. In 1993, medicinal chemist David E. Nichols and colleagues at Purdue University investigated 5-APDB and 6-APDB as serotonin releasing agents and entactogens, examining…
Trip Reports
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Legality
International
1961 Single Convention: 6-APB is not individually scheduled.
1971 Convention on Psychotropic Substances: 6-APB is not individually scheduled.
1988 Convention: 6-APB is not listed in precursor Tables I or II.
By Country
References
Source Pages
Citations
- Simon D. Brandt, Hailey M. Walters, John S. Partilla, Bruce E. Blough, Pierce V. Kavanagh, & Michael H. Baumann. (December 2020). The psychoactive aminoalkylbenzofuran derivatives, 5-APB and 6-APB, mimic the effects of 3,4-methylenedioxyamphetamine (MDA) on monoamine transmission in male rats. Psychopharmacology (Berl), 237(12), 3703–3714. https://doi.org/10.1007/s00213-020-05648-z1
- Welter J, Brandt SD, Kavanagh P, Muller C, & Maurer HH. (2015). Metabolic fate, mass spectral fragmentation, detectability, and differentiation in urine of the benzofuran designer drugs 6-APB and 6-MAPB in comparison to their 5-isomers using GC-MS and LC-(HR)-MSn techniques. Analytical and Bioanalytical Chemistry, 407(12), 3457–3470. https://doi.org/10.1007/s00216-015-8552-212
- Wui Ling Chan, David M Wood, Simon Hudson, & Paul I Dargan. (September 2013). Acute psychosis associated with recreational use of benzofuran 6-(2-aminopropyl)benzofuran (6-APB) and cannabis. Journal of Medical Toxicology, 9(3), 278–81. https://doi.org/10.1007/s13181-013-0306-y1
- Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026 — Federal Register record. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2026L00633/latest1
- Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2026L00633/asmade/2026-05-28/text/original/epub/OEBPS/document_1/document_1.html1
- Explanatory Statement—Therapeutic Goods (Poisons Standard—June 2026) Instrument 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2026L00633/asmade/2026-05-28/es/original/epub/OEBPS/document_1/document_1.html1
- Customs (Prohibited Imports) Regulations 1956 — compilation dated 13 July 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/F1996B03651/2026-07-13/2026-07-13/text/original/epub/OEBPS/document_1/document_1.html1
- Criminal Code Regulations 2019 — compilation C06 dated 13 December 2025. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2019L00561/2025-12-13/2025-12-13/text/original/epub/OEBPS/document_1/document_1.html1
- Criminal Code Act 1995 — compilation dated 30 June 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/C2004A04868/2026-06-30/2026-06-30/text/original/epub/OEBPS/document_2/document_2.html1
- Crimes (Amount of a Penalty Unit) Instrument 2026. legislation.gov.au (n.d.). https://www.legislation.gov.au/F2026N00424/asmade/2026-06-16/text/original/epub/OEBPS/document_1/document_1.html1
Further Reading
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Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
Josie Kins · Updated the article · also 1,4-Butanediol, 1B-LSD, 1cP-AL-LAD and 573 more
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