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    4-AcO-DET molecular structure

    4-AcO-DET Stats & Data

    Ethacetin Ethylacybin 4-acetoxy-det
    NPS DataHub
    MW274.36
    FormulaC16H22N2O2
    CAS1135424-15-5
    IUPAC[3-(2-diethylaminoethyl)-1H-indol-4-yl] acetate
    SMILESCCN(CC)CCc1cnc2cccc(OC(C)=O)c12
    InChIKeyWYEVVQJLTXBMPM-UHFFFAOYSA-N
    Tryptamines
    Chemical Class Substituted tryptamine
    Psychoactive Class Psychedelic

    Receptor Profile

    Receptor Actions

    Agonists
    5-HT2A receptor agonist (partial)
    Other
    Prodrug (metabolizes to 4-HO-DET)

    History & Culture

    4-AcO-DET was first synthesized in 1958 by Albert Hofmann at the Sandoz laboratories in Switzerland. Despite this early synthesis, the compound remained largely unexplored for decades and has accumulated very little documented history of human usage. In the contemporary era, 4-AcO-DET has found limited use as both a recreational designer drug and an entheogenic compound, with most users acquiring it through online research chemical vendors. It remains relatively rare compared to more widely documented psychedelics in the tryptamine class.

    Toxicity

    PsychonautWiki

    The toxicity and long-term health effects of recreational 4-AcO-DET has not been studied in any scientific context and the exact toxic dose is unknown. This is because 4-AcO-DET is a research chemical with a very limited history of human usage. However, it is assumed to have a similar toxicity profile as psilocybin due to their structural similarity. Anecdotal reports from those who have tried 4-AcO-DET suggests that there are no negative health effects attributed to simply trying the substance by itself at low to moderate doses and using it very sparingly (but nothing can be completely guaranteed). Independent research should always be done to ensure that a combination of two or more substances is safe before consumption.

    Effect Profile

    Curated + 30 Reports
    Psychedelic 8.8

    Strong visuals, headspace, and auditory effects with strong body load

    Visual Intensity×3
    1010
    Headspace Depth×3
    108.8
    Auditory Effects×1
    1010
    Body Load / Somatic Effects×1
    108.4
    Catalog Erowid

    Duration Timeline

    Bluelight
    Onset Comeup Peak Offset After Effects
    Oral
    19 minutes - 1.0 hours
    1-1.5 hours
    1.5-3 hours
    1-2 hours
    2-4 hours
    Smoked
    0 minutes
    4-10 minutes
    10-19 minutes
    19-40 minutes
    30 minutes - 1.0 hours

    Tolerance & Pharmacokinetics

    drugs.wiki
    Half-Life
    Unknown in humans; effects typically persist hours despite rapid onset (likely active metabolite 4-HO-DET).
    Addiction Potential
    Not habit-forming; low abuse potential typical of classical psychedelics. Psychological habituation is possible with frequent use.

    Tolerance Decay

    Full tolerance 6h Half tolerance 7d Baseline ~14d

    Estimates inferred from classical psychedelic patterns (psilocybin/LSD) and user reports; quality anecdotal. Avoid redosing to chase effects during the same session due to tolerance spikes and unpredictability.

    Cross-Tolerances

    Psilocybin/Psilocin (4-HO-DMT)
    LSD
    Other 4-substituted tryptamines (e.g., 4-HO/4-AcO-MET/MiPT)

    Experience Report Analysis

    Erowid
    50 Reports
    30 Single-substance
    2001–2021 Date Range
    12 With Age Data
    21 Effects Detected

    Demographics

    Gender Distribution

    Age Distribution

    Reports Over Time

    Effect Analysis

    Erowid

    Effects aggregated from 30 experience reports (30 single-substance Erowid)

    30 Reports
    21 Effects Detected
    12 Positive
    5 Adverse
    4 Neutral

    Effect Sentiment Distribution

    Confidence Distribution

    Each bar is the share of reports mentioning the effect; its whisker, and the band on the rows below, is the 95% interval: where the share could plausibly be with other reports of the same kind.

    Positive Effects 12

    Visual Distortions 76.7% (95% interval 59 to 88 percent) 70%
    Music Enhancement 56.7% (95% interval 39 to 73 percent) 70%
    Color Enhancement 53.3% (95% interval 36 to 70 percent) 70%
    Empathy 40.0% (95% interval 25 to 58 percent) 70%
    Closed-Eye Visuals 36.7% (95% interval 22 to 54 percent) 70%
    Stimulation 36.7% (95% interval 22 to 54 percent) 70%
    Euphoria 33.3% (95% interval 19 to 51 percent) 70%
    Tactile Enhancement 30.0% (95% interval 17 to 48 percent) 70%
    Introspection 30.0% (95% interval 17 to 48 percent) 70%
    Open-Eye Visuals 23.3% (95% interval 12 to 41 percent) 70%
    Body High 23.3% (95% interval 12 to 41 percent) 70%
    Focus Enhancement 10.0% (95% interval 4 to 26 percent) 70%

    Adverse Effects 5

    Anxiety 36.7% (95% interval 22 to 54 percent) 70%
    Muscle Tension 30.0% (95% interval 17 to 48 percent) 70%
    Confusion 26.7% (95% interval 14 to 44 percent) 70%
    Nausea 20.0% (95% interval 10 to 37 percent) 70%
    Jaw Clenching 10.0% (95% interval 4 to 26 percent) 70%
    Show 4 neutral or unclassified mentions
    Sedation 20.0% (95% interval 10 to 37 percent)
    Ego Dissolution 13.3% (95% interval 5 to 30 percent)
    Time Distortion 10.0% (95% interval 4 to 26 percent)
    Dissociation 10.0% (95% interval 4 to 26 percent)

    Also reported in combinations. In the 20 4-AcO-DET reports where another drug was taken too, 0 (0.0%) mention hospital, emergency services or an overdose, 0 (0.0%) a seizure and 1 (5.0%) psychosis. In the 30 single-substance reports: 0.0%, 0.0% and 0.0%. These are not in the figures above: they cannot be put down to 4-AcO-DET alone, and a mention is not always something that happened to the writer.

    Dosage Distribution

    Dose distribution from experience reports, one dose per report (the first listed). Doses above Q3 + 3×IQR, far above what people typically take, are left out of the median and range and listed under each route: most are real heavy doses or overdoses, not mistakes.

    Median: 20.0 mg IQR: 15.0–25.0 mg n=27

    Real-World Dose Distribution

    Erowid

    From 66 of 75 recorded dose entries: those that state a weight (mg, g or µg), in routes with at least five of them. Values above Q3 + 3×IQR, far above what people typically take, are left out; they can include real heavy doses and overdoses, not only mistakes.

    Oral (n=60)

    Median: 16.0mg 25th: 10.0mg 75th: 20.0mg 90th: 25.5mg

    Insufflated (n=6)

    Median: 17.5mg 25th: 15.0mg 75th: 20.0mg 90th: 27.5mg

    Common Combinations

    Most co-occurring substances, as a share of all 50 reports filed under 4-AcO-DET; whiskers are 95% intervals

    Form / Preparation

    Most common forms and preparations, as a share of the 36 reports that give one; whiskers are 95% intervals

    Body-Weight Dosing

    Dose per kg of body weight, one dose per report (the first listed), from reports giving a weight of 30–250 kg. Doses above Q3 + 3×IQR, far above what people typically take, are left out of the median and range and listed under each route.

    Median: 0.282 mg/kg IQR: 0.235–0.353 mg/kg n=21

    Redose Patterns

    Redosing behavior across 39 reports

    17.9% (95% interval 9 to 33 percent) Redosed
    1.3 Avg Doses

    Legal Status

    Country Status Notes
    Germany Anlage I BtMG Controlled under Anlage I of the Betäubungsmittelgesetz (Narcotics Act) since January 24, 1974, as it is classified as an ester of DET. Manufacturing, possession, importation, exportation, purchase, sale, and distribution are prohibited without a license.
    Japan Controlled Designated as a controlled substance effective July 29, 2015, under national drug control legislation.
    Sweden Controlled Classified as a health hazard under Lagen om förbud mot vissa hälsofarliga varor (Act on the Prohibition of Certain Goods Dangerous to Health) effective November 1, 2005, under regulation SFS 2005:733. Possession and sale are illegal.
    Switzerland Controlled (Verzeichnis E) Specifically named as a controlled substance under Verzeichnis E since November 1, 2005, pursuant to the Act on the Prohibition of Certain Goods Dangerous to Health.
    Turkey Illegal Classified as a controlled drug. Possession, production, supply, and importation are prohibited under Turkish drug law.
    United Kingdom Class A Controlled as a Class A substance due to its status as an ester of 4-HO-DET, which falls under the tryptamine catch-all clause of the Misuse of Drugs Act 1971. Carries the most severe penalties for possession, production, and supply.
    United States Unscheduled Not federally scheduled under the Controlled Substances Act. However, as a structural analogue of psilocin (4-HO-DMT), which is a Schedule I substance, sale for human consumption or use for illicit purposes could potentially be prosecuted under the Federal Analogue Act.

    Harm Reduction

    drugs.wiki

    4-AcO-DET likely deacetylates in vivo to 4-HO-DET (ethocin), so potency, onset, and duration can vary with metabolism; users report both short (2–4 h) and longer (6–8 h) courses. Anecdotal reports describe stronger, shorter effects via intranasal or smoked routes, but these also carry more irritation and unpredictability; oral is the most characterized and generally lowest risk ROA. Like other 4-substituted tryptamines, nausea and GI unease can occur, particularly on the come-up; fasting 3–4 h and using ginger/antiemetic strategies may help. Avoid mixing with MAOIs, tramadol, DXM, or linezolid due to serotonin toxicity risk; lithium with psychedelics has repeatedly been linked with seizures and severe adverse reactions in community reports. SSRIs/SNRIs and some antipsychotics may attenuate psychedelic effects, but they can still contribute to serotonergic burden; effects can be unpredictable. Misrepresentation in the gray/illicit market is a documented risk (e.g., tryptamines sold as psilocybin or vice versa); reagent testing (Ehrlich for indoles) and lab drug checking reduce this risk, although reagents cannot confirm exact identity. Store away from heat, moisture, and light; 4-AcO esters can hydrolyze over time to 4-HO analogs—color changes (tanning/darkening) have been reported alongside retained potency, but degradation is formulation- and storage-dependent. Tolerance builds rapidly after a single session and decays over about 1–2 weeks; cross-tolerance exists with other classical psychedelics (psilocin/psilocybin, LSD, other 4-sub tryptamines). Set and setting strongly influence outcomes; a trusted sober sitter, safe environment, and clear intentions reduce risk of panic and dangerous behavior. Seek urgent medical help for signs of serotonin toxicity (agitation, hyperthermia, tremor/clonus, confusion), chest pain, persistent vomiting, seizures, or severe confusion; disclose all substances to responders.

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