How long does 4-HO-DET last?

The total duration of 4-HO-DET via oral is 5 hours to 7 hours. Onset typically occurs within 20 minutes to 45 minutes. Peak effects last 2.5 hours to 3.5 hours.

4-HO-DET — SubstanceWiki

Q: What is 4-HO-DET?

Psychedelic drug 4-HO-DET, also known as 4-hydroxy-N,N-diethyltryptamine as well as ethocin or CZ-74, is a psychedelic drug of the tryptamine and 4-hydroxytryptamine families related to psilocin (4-HO-DMT). It is taken orally. The drug acts as a non-selective serotonin receptor agonist, including of

4-HO-DET, also known as 4-hydroxy-N,N-diethyltryptamine as well as ethocin or CZ-74, is a psychedelic drug of the tryptamine and 4-hydroxytryptamine families related to psilocin (4-HO-DMT). It is taken orally.

The drug acts as a non-selective serotonin receptor agonist, including of the serotonin 5-HT2A receptor among others. It produces psychedelic-like effects in animals. 4-HO-DET is closely structurally related to other psychedelic tryptamines such as psilocin, diethyltryptamine (DET), and 4-HO-MET. Ethocybin (4-PO-DET; CEY-19) and 4-AcO-DET are assumed to act as prodrugs of 4-HO-DET.

4-HO-DET was first described in the literature by 1963. It was developed at Sandoz by Albert Hofmann and colleagues. The drug was studied in psychedelic-assisted psychotherapy by Hanscarl Leuner and colleagues in the 1960s. Later, it was described further by Alexander Shulgin in his 1997 book TiHKAL (Tryptamines I Have Known and Loved). 4-HO-DET was encountered as a novel designer drug in 2005.

How 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(11)

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...
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(13)

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,...
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...

Pharmacology

As with its structurally related tryptamines, 4-HO-DET principally acts as a 5-HT2A partial agonist, through which it exerts its psychedelic effects.

However, the role of these interactions and how they result in the psychedelic experience continues to remain an object of scientific elucidation.

In comparison to other isolated synthetic tryptamine compounds such as 4-AcO-DMT and 4-HO-DMT, 4-HO-DET has been reported as being similar in terms of its visual, cognitive and physical effects, albeit with a slightly longer duration, less in the way of bodily effects, and more "synthetic" or "algorithmic"-style visuals.

The toxicity and long-term health effects of recreational 4-HO-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.

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-AcO-DET
4-HO-DMT
4-HO-MET
DET
4-HO-DET (Wikipedia)
4-HO-DET (TiHKAL / Isomer Design)
4-HO-DET phosphate ester (Isomer Design)
4-HO-DET (Bluelight)

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
APICA	Caution	Cannabis can unpredictably intensify psychedelic effects and increase anxiety
Atropa belladonna	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Benzydamine	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Bromantane	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Cannabidiol	Caution	Cannabis can unpredictably intensify psychedelic effects and increase anxiety
Datura	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Dichloropane	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Diphenhydramine	Caution	Unpredictable compounding of hallucinogenic effects with anticholinergic delirium
Ephedrine	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Harmala alkaloid	Caution	MAOIs dramatically potentiate psychedelics; drastically reduce dose and exercise extreme caution
Hexedrone	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Methcathinone	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Nicotine	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Oxiracetam	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Peganum harmala	Caution	MAOIs dramatically potentiate psychedelics; drastically reduce dose and exercise extreme caution
Phenylpiracetam	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
Rhodiola Rosea	Caution	Increases anxiety, cardiovascular stress, and psychological intensity
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
2C-T-21	Low Risk & Synergy	Cross-tolerance exists; effects compound
2C-T-7	Low Risk & Synergy	Cross-tolerance exists; effects compound
3-Cl-PCP	Low Risk & Synergy	Produces unique synergistic effects; often combined
3-HO-PCE	Low Risk & Synergy	Produces unique synergistic effects; often combined
3-HO-PCP	Low Risk & Synergy	Produces unique synergistic effects; often combined
3-MeO-PCE	Low Risk & Synergy	Produces unique synergistic effects; often combined
3-MeO-PCMo	Low Risk & Synergy	Produces unique synergistic effects; often combined
3-MeO-PCP	Low Risk & Synergy	Produces unique synergistic effects; often combined
4-MeO-PCP	Low Risk & Synergy	Produces unique synergistic effects; often combined
Allylescaline	Low Risk & Synergy	Cross-tolerance exists; effects compound
Ayahuasca	Low Risk & Synergy	Cross-tolerance exists; effects compound
Deschloroketamine	Low Risk & Synergy	Produces unique synergistic effects; often combined
DET	Low Risk & Synergy	Cross-tolerance exists; effects compound
Diphenidine	Low Risk & Synergy	Produces unique synergistic effects; often combined
DiPT	Low Risk & Synergy	Cross-tolerance exists; effects compound
DOM	Low Risk & Synergy	Cross-tolerance exists; effects compound
DPT	Low Risk & Synergy	Cross-tolerance exists; effects compound
Efavirenz	Low Risk & Synergy	Cross-tolerance exists; effects compound
Ephenidine	Low Risk & Synergy	Produces unique synergistic effects; often combined
EPT	Low Risk & Synergy	Cross-tolerance exists; effects compound
HXE	Low Risk & Synergy	Produces unique synergistic effects; often combined
Ibogaine	Low Risk & Synergy	Cross-tolerance exists; effects compound
Inhalants	Low Risk & Synergy	Produces unique synergistic effects; often combined
Memantine	Low Risk & Synergy	Produces unique synergistic effects; often combined
MET	Low Risk & Synergy	Cross-tolerance exists; effects compound
Methallylescaline	Low Risk & Synergy	Cross-tolerance exists; effects compound
MiPT	Low Risk & Synergy	Cross-tolerance exists; effects compound
MPT	Low Risk & Synergy	Cross-tolerance exists; effects compound
MXiPr	Low Risk & Synergy	Produces unique synergistic effects; often combined
O-PCE	Low Risk & Synergy	Produces unique synergistic effects; often combined
PCE	Low Risk & Synergy	Produces unique synergistic effects; often combined
Psilocybin Mushrooms	Low Risk & Synergy	Cross-tolerance exists; effects compound
Lorazepam	Low Risk & Decrease	Depressants dull psychedelic effects; benzodiazepines are commonly used as trip-killers

Showing 60 key interactions out of 79 total.

Toxicity & Safety

Further information: Research chemicals § Toxicity and harm potential, and Responsible use § Hallucinogens 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.

4-HO-DET

Quick Dosage

Dosage

oral

Duration

oral

How It Feels

Subjective Effects

Physical Effects

Physical(11)

Tactile(1)

Cognitive & Perceptual Effects

Visual(13)

Pharmacology

Detection Methods

Urine Detection

Blood and Serum Detection

Standard Drug Panel Inclusion

Confirmatory Methods

Reagent Testing (Harm Reduction)

Interactions

History

Harm Reduction

Toxicity & Safety

Addiction Potential

Overdose Information

Tolerance

Cross-tolerances

Legal Status

Experience Reports (2)

Tips (4)

See Also

References (4)

Frequently Asked Questions

Cognitive(16)

Transpersonal(1)