Overview
4-HO-DET (4-hydroxy-N,N-diethyltryptamine), also known as ethocin orCZ-74, is a synthetic psychedelic tryptamine first synthesized in the 1950s by Albert Hofmann at the Sandoz pharmaceutical laboratories in Basel, Switzerland. It is a close structural analog of psilocin (4-HO-DMT), differing only in the substitution of two ethyl groups on the terminal amine nitrogen in place of psilocin's two methyl groups .
Sandoz briefly made the compound available for research under the trade name "Ethocin," positioning it alongside psilocybin and psilocin as a tool for psychotherapeutic investigation. However, unlike psilocybin, 4-HO-DET never gained significant traction in clinical research and was largely forgotten by mainstream pharmacology after the regulatory clampdowns of the late 1960s .
A prodrug form, 4-AcO-DET (4-acetoxy-N,N-diethyltryptamine), also exists and is believed to undergo hydrolysis to 4-HO-DET in vivo, mirroring the relationship between psilocybin and psilocin. 4-HO-DET has resurfaced in the modern era as a novel psychoactive substance, though it remains poorly characterized compared to its more famous relatives .
References
- Hofmann A, Troxler F. Identifizierung von Psilocin. Experientia. 1959;15:101-102.
- Repke DB, Ferguson WJ. Psilocin analogs. 1. Synthesis of 3-[2-(dialkylamino)ethyl]- and 3-[2-(cycloalkylamino)ethyl]indol-4-ols. J Heterocyclic Chem. 1977;14:71-74.
Safety at a Glance
High Risk- HO-not habit-forming and the desire to use it can actually decrease with use. It is most often self-regulating.
- Switzerland: 4-HO-DET is a controlled substance specifically named under Verzeichnis E.
- Toxicity: The toxicity and long-term health effects of recreational 4-HO-DET use do not seem to have been studied in any scient...
- Overdose risk: Fatal overdose from 4-HO-DET alone, at doses within the typical recreational range, is extremely ...
If someone is in crisis, call 911 or Poison Control: 1-800-222-1222
Dosage
oral
Duration
oral
Total: 5 hrs – 7 hrsHow It Feels
The first intimations of 4-HO-DET appear within twenty to thirty minutes: a subtle sharpening of sensory input, as though the resolution on perception has been quietly increased. Edges become crisper, textures more defined, and there is a faint luminosity to surfaces that was not there moments ago. A light body buzz builds in the torso and extremities — tingling, effervescent, accompanied by a slight tightening in the jaw that never quite becomes uncomfortable. The stomach may protest mildly, but the nausea is fleeting.
Over the next thirty to sixty minutes, the experience climbs steadily into its full expression. Visuals develop a distinctive character: rather than the flowing organic distortions of classic mushroom-like tryptamines, 4-HO-DET produces patterns that are sharp, crystalline, and almost architectural. Geometric lattices overlay surfaces with precision, their lines crisp and their angles defined. Colors shift toward cooler tones — teals, silvers, electric blues — giving the visual landscape an almost futuristic quality. Closed-eye visuals are extraordinary: complex three-dimensional structures that rotate and reconfigure themselves, vast digital-seeming landscapes, and fractal patterns that unfold with mathematical elegance.
At the peak, roughly ninety minutes to two hours in and lasting for two to three hours, the headspace reveals itself as uniquely balanced between analytical clarity and genuine psychedelic depth. Thoughts arrive with unusual precision but also with emotional richness — it is possible to think clearly about complex personal matters while simultaneously feeling their full weight. The body feels light and alert, gently stimulated without restlessness. There is a quality of focused wonder, as though the mind has been given both a telescope and a microscope and cannot decide which is more interesting. Social interaction is possible and can be deeply rewarding, as empathy is enhanced without the communication difficulties that stronger tryptamines sometimes produce.
The comedown unfolds over two to three hours, the crystalline geometry slowly dissolving into a gentle visual shimmer. Energy remains adequate — there is no crash, no heavy fatigue, just a gradual normalization accompanied by a calm, satisfied afterglow. The total duration is five to seven hours, moderate by tryptamine standards, and the experience tends to leave behind a sense of having seen familiar things from a new and illuminating angle.
Subjective Effects
The effects listed below are based on the Subjective Effect Index (SEI), an open research literature based on anecdotal reports and personal analyses. They should be viewed with a healthy degree of skepticism. These effects will not necessarily occur in a predictable or reliable manner, although higher doses are more liable to induce the full spectrum of effects.
Physical Effects
Physical(13)
- Bodily control enhancement— Bodily control enhancement is the subjective feeling of improved physical precision, coordination, a...
- Excessive yawning— Involuntary, repeated yawning that occurs far more frequently than normal and often without the usua...
- Frequent urination— Increased urinary frequency beyond normal patterns, caused by diuretic effects or bladder irritation...
- Increased heart rate— A noticeable acceleration of heartbeat that can range from a subtle awareness of one's pulse to a fo...
- Laughter fits— Spontaneous, uncontrollable, and often prolonged episodes of intense laughter that erupt without any...
- Nausea— An uncomfortable sensation of queasiness and stomach discomfort that may or may not lead to vomiting...
- Pupil dilation— A visible enlargement of the pupil diameter (mydriasis) that can range from subtle widening to drama...
- Runny nose— Excessive nasal discharge commonly occurring during opioid withdrawal or from nasal irritation cause...
- Sedation— A state of deep physical and mental calming that manifests as a progressive desire to remain still, ...
- Seizure— Uncontrolled brain electrical activity causing convulsions and loss of consciousness -- a life-threa...
- Stimulation— A state of heightened physical and mental energy characterized by increased wakefulness, elevated mo...
- Temperature regulation disruption— Impaired thermoregulation causing unpredictable fluctuations between feeling hot and cold, with risk...
- Watery eyes— Excessive tear production causing overflow tearing and blurred vision, commonly occurring during opi...
Tactile(1)
- Tactile enhancement— The sense of touch becomes dramatically heightened, making physical contact feel intensely pleasurab...
Cognitive & Perceptual Effects
Visual(15)
- Colour enhancement— An intensification of the brightness, vividness, and saturation of colors in the external environmen...
- Colour shifting— The visual experience of colors on objects and surfaces cycling through continuous, fluid transforma...
- Depth perception distortions— Alterations in how the distance of objects within the visual field is perceived, causing layers of s...
- Drifting— The visual experience of perceiving stationary objects, textures, and surfaces as appearing to flow,...
- External hallucination— A visual hallucination that manifests within the external environment as though it were physically r...
- Geometry— The experience of perceiving complex, ever-shifting geometric patterns superimposed over the visual ...
- Internal hallucination— Vivid, detailed visual experiences perceived within an imagined mental landscape that can only be se...
- Pattern recognition enhancement— An increased ability and tendency to perceive meaningful patterns, faces, and images within ambiguou...
- Perspective distortions— Distortion of perceived depth, distance, and size of real objects, making things appear closer, furt...
- Perspective hallucination— A hallucinatory phenomenon in which the observer's visual perspective shifts from the normal first-p...
- Settings, sceneries, and landscapes— The perceived environment in which hallucinatory experiences take place, ranging from recognizable l...
- Symmetrical texture repetition— Textures appear to mirror and tessellate across surfaces in intricate, self-similar symmetrical patt...
- Tracers— Moving objects leave visible trails of varying length and opacity behind them, similar to long-expos...
- Transformations— Objects and scenery undergo perceived visual metamorphosis, smoothly shapeshifting into other recogn...
- Visual acuity enhancement— Vision becomes sharper and more defined than normal, as though a slightly blurry lens has been broug...
Cognitive(18)
- Analysis enhancement— A perceived improvement in one's ability to logically deconstruct concepts, recognize patterns, and ...
- Anxiety— Intense feelings of apprehension, worry, and dread that can range from a subtle background unease to...
- Conceptual thinking— A shift in the nature of thought from verbal, linear sentence structures to intuitive, non-linguisti...
- Confusion— An impairment of abstract thinking marked by a persistent inability to grasp or comprehend concepts ...
- Immersion enhancement— A heightened capacity to become fully absorbed and engrossed in external media such as music, films,...
- Increased sense of humor— A general amplification of one's sensitivity to finding things humorous and amusing, often causing p...
- Mania— Abnormally elevated mood, energy, and activity with impulsive behavior and grandiosity, associated w...
- Memory suppression— A dose-dependent inhibition of one's ability to access and utilize short-term and long-term memory, ...
- Novelty enhancement— A feeling of increased fascination, awe, and childlike wonder attributed to everyday concepts, objec...
- Panic attack— A panic attack is a discrete episode of acute, overwhelming fear or terror that arises suddenly and ...
- Paranoia— Irrational suspicion and belief that others are watching, plotting against, or intending harm toward...
- Personal bias suppression— A decrease in the personal, cultural, and cognitive biases through which one normally filters their ...
- Psychosis— Psychosis is a serious psychiatric state involving a fundamental break from consensus reality — char...
- Thought acceleration— The experience of thoughts occurring at a dramatically increased rate, as if the mind has been shift...
- Thought connectivity— A state in which disparate thoughts, concepts, and ideas become fluidly and spontaneously interconne...
- Thought loops— Becoming trapped in a repeating cycle of thoughts, actions, and emotions that loops every few second...
- Time distortion— Subjective perception of time becomes dramatically altered — minutes may feel like hours, or hours p...
- Wakefulness— An increased ability to stay awake and alert without the desire to sleep. Distinct from stimulation ...
Multi-sensory(3)
- Machinescapes— Machinescapes are complex multisensory hallucinations involving the perception of enormous mechanica...
- Olfactory hallucination— Olfactory hallucinations (phantosmia) involve the perception of convincing phantom smells — pleasant...
- Scenarios and plots— Scenarios and plots are the narrative structures that emerge within hallucinatory states — coherent ...
Transpersonal(1)
- Ego death— A profound dissolution of the sense of self in which personal identity, memories, and the boundary b...
Pharmacology
Pharmacology
Mechanism of Action
4-HO-DET exerts its psychoactive effects primarily through partial agonism at the serotonin 5-HT2A receptor, the principal target responsible for the perceptual and cognitive changes characteristic of classical psychedelics. This mechanism is shared across the 4-substituted tryptamine family, including psilocin, 4-HO-MET, and 4-HO-MiPT .
Structural Relationship to Psilocin
The compound is a direct structural analog of psilocin (4-HO-DMT) in which both N-methyl groups are replaced with N-ethyl groups. Research on the structure-activity relationships of substituted tryptamines has shown that extending the N-alkyl chains from methyl to ethyl generally preserves agonist potency at the 5-HT2A receptor while modestly altering the subjective character and duration of effects .
Receptor Selectivity
Like other 4-hydroxytryptamines, 4-HO-DET is expected to interact with multiple serotonin receptor subtypes beyond 5-HT2A, including 5-HT2C and 5-HT1A receptors. The diethyl substitution pattern may modulate the compound's relative selectivity across these targets, though systematic binding data specifically for 4-HO-DET remain sparse in the published literature .
Research Gaps
Despite its structural similarity to psilocin and its early availability through Sandoz, 4-HO-DET has received minimal attention in contemporary neuropsychopharmacological research. No controlled human studies have been conducted, and most pharmacological inferences are drawn from structural analogy and limited in vitro work .
References
- Ray TS. Psychedelics and the human receptorome. PLoS ONE. 2010;5(2):e9019.
- Repke DB, Ferguson WJ. Psilocin analogs. 1. Synthesis of 3-[2-(dialkylamino)ethyl]- and 3-[2-(cycloalkylamino)ethyl]indol-4-ols. J Heterocyclic Chem. 1977;14:71-74.
Detection Methods
Urine Detection
4-HO-DET is not targeted by standard immunoassay-based urine drug screens. Specialized LC-MS/MS methods can detect 4-substituted tryptamine metabolites in urine for approximately 24 to 48 hours after ingestion. The detection window is relatively short compared to many other drug classes due to the rapid hepatic metabolism and renal clearance of tryptamine compounds. Psilocin (4-HO-DMT) is the most commonly targeted analyte in specialized tryptamine panels, and structural analogs may or may not be captured depending on the specific method.
Blood and Serum Detection
Blood detection windows for 4-HO-DET are short, typically 4 to 12 hours after oral ingestion. Peak plasma concentrations of the active metabolite occur within 1 to 2 hours. The rapid first-pass metabolism means that parent compound concentrations in blood are often negligible for 4-AcO prodrugs, while 4-HO compounds themselves are measured directly. LC-MS/MS is required for reliable serum detection at the low concentrations involved.
Standard Drug Panel Inclusion
4-HO-DET is NOT included on standard 5-panel, 10-panel, or 12-panel drug screens. Tryptamines do not cross-react with immunoassay targets for any of the standard panel analytes (amphetamines, cannabinoids, cocaine metabolites, opiates, PCP, benzodiazepines, or barbiturates). Detection requires a specific request for tryptamine or novel psychoactive substance testing at a reference laboratory. Some extended forensic panels include psilocin, which may capture certain 4-substituted tryptamines, but this coverage is not guaranteed for all structural variants.
Confirmatory Methods
Confirmatory identification of 4-HO-DET relies on LC-MS/MS with reference standards specific to the compound or its expected metabolites. GC-MS can also be used following appropriate derivatization. Immunoassay-based methods for psilocybin and psilocin exist but show variable cross-reactivity with structural analogs and are not considered reliable for novel 4-substituted tryptamines. Reference laboratories specializing in novel psychoactive substances offer the most comprehensive detection capabilities.
Reagent Testing (Harm Reduction)
The Ehrlich reagent is the primary harm reduction tool for 4-HO-DET. A sample placed on the reagent should produce a purple to violet color change, confirming the presence of an indole ring system characteristic of tryptamines. This reaction is shared with LSD, psilocybin, DMT, and all indole-containing compounds, so it confirms the general class but not the specific identity. The Hofmann reagent provides a confirmatory blue to violet reaction for tryptamines. The Marquis reagent typically shows no reaction or a dark brown discoloration with 4-substituted tryptamines. A positive Ehrlich result significantly reduces the probability that the substance is a dangerous substitute such as an NBOMe compound.
Interactions
| Substance | Status | Note |
|---|---|---|
| 3-FMA | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 4-MMC | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| 8-Chlorotheophylline | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| Adrafinil | Caution | Increases anxiety, cardiovascular stress, and psychological intensity |
| Anandamide | Caution | Cannabis can unpredictably intensify psychedelic effects and increase anxiety |
| Cannabis | Uncertain | — |
| 1,3-Butanediol | Low Risk & Synergy | Cross-tolerance exists; effects compound |
| 25E-NBOH | Low Risk & Synergy | Cross-tolerance exists; effects compound |
| 2C-T | Low Risk & Synergy | Cross-tolerance exists; effects compound |
| 2C-T-2 | Low Risk & Synergy | Cross-tolerance exists; effects compound |
History
The history of 4-HO-DET is intertwined with the broader story of psychedelic research, which has oscillated between periods of intense scientific interest and strict prohibition.
Like many psychedelic compounds, 4-HO-DET was either synthesized in a laboratory setting or identified as a naturally occurring psychoactive substance through ethnobotanical research. The mid-20th century saw an explosion of interest in psychedelic compounds, with researchers exploring their potential applications in psychotherapy, creativity enhancement, and the study of consciousness.
The political and cultural backlash of the late 1960s and early 1970s led to the criminalization of most psychedelic substances, effectively halting legitimate research for decades. The resurgence of psychedelic research beginning in the 2000s — often called the "psychedelic renaissance" — has renewed scientific interest in this class of compounds, with clinical trials exploring applications in treatment-resistant depression, PTSD, end-of-life anxiety, and addiction.
4-HO-DET exists within this broader pharmacological and cultural context, with its specific history shaped by its date of discovery, legal status, availability, and unique pharmacological profile.
Harm Reduction
4-HO-not habit-forming and the desire to use it can actually decrease with use. It is most often self-regulating.
Tolerance to the effects of 4-HO-almost immediately after ingestion. After that,37 days to be back at baseline (in the absence of further consumption). 4-HO-DET presents cross-tolerance with Cross-all psychedelics, meaning that after the consumption of 4-HO-DET all psychedelics will have a reduced effect.
Germany: 4-HO-DET is controlled under Anlage I BtMG (Narcotics Act, Schedule I), former: Opiumgesetz (Opium Act) as of February 25, 1967. It is illegal to manufacture, possess, import, export, buy, sell, procure or dispense it without a license.
Sweden:** 4-HO-DET is classified as a health hazard under the Act on the Prohibition of Certain Goods Dangerous to Health as of November 1, 2005 in the regulation SFS 2005:733, making it illegal to sell or possess.
Switzerland: 4-HO-DET is a controlled substance specifically named under Verzeichnis E.
United Kingdom: 4-HO-DET is a Class A drug in the United Kingdom as a result of the tryptamine catch-all clause.
United States: 4-HO-DET is unscheduled in the United States. It may be considered an analogue of psilocin (4-HO-DMT) which is a Schedule I drug under the Controlled Substances Act. As such, the sale for human consumption or the use for illicit non-medical or industrial intents and purposes could be prosecuted as crimes under the Federal Analogue Act.
Responsible use
Research chemical
Psychedelic
Tryptamine
4-HO-DMT
DET
4-HO-DET (Wikipedia)
4-HO-DET (TiHKAL / Isomer Design)
Toxicity & Safety
The toxicity and long-term health effects of recreational 4-HO-DET use do not seem to have been studied in any scientific context and the exact toxic dose is unknown. This is because 4-HO-DET is a research chemical with very little history of human usage. Anecdotal evidence from people within the psychonaut community who have tried 4-HO-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 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.
It is strongly recommended that one use harm reduction practices when using this substance.
Tolerance and addiction potential
4-HO-DET is not habit-forming and the desire to use it can actually decrease with use. It is most often self-regulating.
Tolerance to the effects of 4-HO-DET is built almost immediately after ingestion. After that, it takes about 3 days for the tolerance to be reduced to half and 7 days to be back at baseline (in the absence of further consumption). 4-HO-DET presents cross-tolerance with all psychedelics, meaning that after the consumption of 4-HO-DET all psychedelics will have a reduced effect.
Dangerous interactions
Warning: Many psychoactive substances that are reasonably safe to use on their own can suddenly become dangerous and even life-threatening when combined with certain other substances. The following list provides some known dangerous interactions (although it is not guaranteed to include all of them).
Always conduct independent research (e.g. Google, DuckDuckGo, PubMed) to ensure that a combination of two or more substances is safe to consume. Some of the listed interactions have been sourced from TripSit.
Lithium - Lithium is commonly prescribed for the treatment of bipolar disorder. There is a large body of anecdotal evidence that suggests taking it with psychedelics significantly increases the risk of psychosis and seizures. As a result, this combination is strictly discouraged.
Cannabis - Cannabis may have an unexpectedly strong and unpredictable synergy with the effects of 4-HO-DET. Caution is advised with this combination as it can significantly increase the risk of adverse psychological reactions like anxiety, paranoia, panic attacks, and psychosis. Users are advised to start off with only a fraction of their normal cannabis dose and take long breaks between hits to avoid unintentional overdose.
Stimulants - Stimulants like amphetamine, cocaine or methylphenidate affect many parts of the brain and alter dopaminergic function. This combination can increase the risk of anxiety, paranoia, panic attacks, and thought loops. This interaction may also result in an elevated risk of mania and psychosis.
Tramadol - Tramadol is well-documented to lower the seizure threshold and psychedelics may act to trigger seizures in susceptible individuals.
Addiction Potential
not habit-forming
Overdose Information
Fatal overdose from 4-HO-DET alone, at doses within the typical recreational range, is extremely unlikely based on the available evidence for classical psychedelics. The therapeutic index for most psychedelics is very wide.
However, psychological emergencies can occur and require appropriate response:
- Severe anxiety, panic, or psychotic episodes
- Dangerous behavior due to impaired reality testing
- Self-harm in the context of a distressing experience
Emergency management: If someone is experiencing a severe adverse reaction, move them to a calm, quiet environment. Speak reassuringly. Do not restrain unless there is immediate danger. Benzodiazepines (if available and the person is conscious and able to swallow) can reduce acute anxiety. If psychotic symptoms, self-harm risk, or medical distress is present, seek emergency medical attention.
Medical attention: Seek help immediately for seizures, extremely elevated body temperature, signs of serotonin syndrome (agitation, tremor, diarrhea, rapid heart rate), or if the substance consumed is uncertain.
Tolerance
| Full | almost immediately after ingestion |
| Half | 3 days |
| Zero | 7 days |
Cross-tolerances
Legal Status
Germany: 4-HO-DET is controlled under Anlage I BtMG (Narcotics Act, Schedule I), former: Opiumgesetz (Opium Act) as of February 25, 1967. It is illegal to manufacture, possess, import, export, buy, sell, procure or dispense it without a license.
Sweden:** 4-HO-DET is classified as a health hazard under the Act on the Prohibition of Certain Goods Dangerous to Health as of November 1, 2005 in the regulation SFS 2005:733, making it illegal to sell or possess.
Switzerland: 4-HO-DET is a controlled substance specifically named under Verzeichnis E.
United Kingdom: 4-HO-DET is a Class A drug in the United Kingdom as a result of the tryptamine catch-all clause.
United States: 4-HO-DET is unscheduled in the United States. It may be considered an analogue of psilocin (4-HO-DMT) which is a Schedule I drug under the Controlled Substances Act. As such, the sale for human consumption or the use for illicit non-medical or industrial intents and purposes could be prosecuted as crimes under the Federal Analogue Act.
Responsible use
Research chemical
Psychedelic
Tryptamine
4-HO-DMT
DET
4-HO-DET (Wikipedia)
4-HO-DET (TiHKAL / Isomer Design)
4-HO-DET phosphate ester (Isomer Design)
4-HO-DET (Bluelight)
Experience Reports (2)
Tips (4)
Use a milligram scale to weigh 4-HO-DET if it comes as a powder. Eyeballing doses of potent psychedelics is irresponsible. A quality 0.001g scale costs under $30 and could prevent a seriously overwhelming experience.
Do not combine 4-HO-DET with lithium (seizure risk), tramadol (seizure/serotonin syndrome risk), or cannabis at higher doses unless very experienced. Cannabis dramatically intensifies and can destabilize a psychedelic experience.
Keep a benzodiazepine like alprazolam on hand as an emergency trip abort tool when using 4-HO-DET. Even just knowing you have one available provides psychological reassurance. It will not fully end the trip but significantly reduces intensity.
Have a trip sitter present, ideally someone with psychedelic experience. They should remain calm and reassuring without being intrusive. A good sitter can make the difference between a challenging experience and a genuine crisis.
See Also
References (4)
- Psilocybin produces substantial and sustained decreases in depression and anxiety — Griffiths et al. Journal of Psychopharmacology (2016)paper
- Neural correlates of the LSD experience revealed by multimodal neuroimaging — Carhart-Harris et al. PNAS (2016)paper
- 4-HO-DET - TripSit Factsheet
TripSit factsheet for 4-HO-DET
tripsit - 4-HO-DET - Wikipedia
Wikipedia article on 4-HO-DET
wikipedia