4-HO-MET is known to produce auditory hallucination, a auditory effect. Auditory hallucination is the perception of sounds that have no external source — hearing music, voices, environmental noises, or abstract sonic phenomena that exist entirely within the mind. These range from faint, ambiguous whispers at the edge of perception to fully formed, complex musical compositions or conversational speech that can feel completely real and externally sourced.
From a first-person perspective, auditory hallucinations manifest as sounds that feel genuinely external — as though they originate from somewhere in the physical environment — despite having no corresponding source. One may hear faint music playing from another room, indistinct conversational murmuring, environmental sounds like running water or wind, or entirely novel sonic phenomena such as buzzing, chiming, or crystalline tones. At higher intensities, full musical compositions may be perceived with remarkable complexity and fidelity, sometimes in genres or styles the listener has never heard before. Voices may speak coherent sentences, sometimes addressing the user directly, though insight is usually maintained that these are drug-induced.
At threshold levels, auditory hallucinations present as vague, ambiguous sounds — one might question whether a faint sound was real or imagined. At light to moderate intensities, the hallucinations become more distinct: identifiable snippets of music, recognizable whispered words, or phantom environmental sounds like doorbells or phone notifications. At strong doses, fully formed auditory experiences emerge — entire songs with lyrics, complex conversations, or rich environmental soundscapes that are indistinguishable from reality until one actively questions their origin. At overwhelming levels, the hallucinated audio can completely dominate the perceptual field, making it difficult to distinguish real from imagined sound.
Musical hallucinations involve hearing melodies, harmonies, or complete compositions, often novel and not drawn from memory.Verbal hallucinations consist of hearing words or sentences — these may be fragments, gibberish, or coherent speech.Environmental hallucinations replicate familiar ambient sounds (rain, traffic, appliances).Abstract sonic hallucinations produce sounds without clear real-world analogues — geometric buzzing, fractal tones, or sounds that seem to have visual or spatial properties. Auditory hallucinations can beopen-eye (perceived as external) orclosed-eye (perceived as internal, mind's-ear phenomena).
Auditory hallucinations arise from spontaneous activation of auditory cortical areas in the absence of corresponding external stimuli. Serotonergic psychedelics facilitate this through 5-HT2A agonism, which increases spontaneous neural firing in auditory association cortex and disrupts the brain's ability to distinguish internally generated signals from external input. Dissociatives produce auditory hallucinations through NMDA antagonism, which impairs sensory gating mechanisms and can lead to disinhibited firing in temporal lobe auditory regions. Deliriants such as diphenhydramine produce particularly vivid and realistic auditory hallucinations through muscarinic acetylcholine receptor antagonism, which profoundly disrupts the neurotransmitter systems involved in reality testing.
Auditory hallucinations occur across many substance classes but with qualitatively different characters. Psychedelics (LSD, psilocybin, DMT) tend to produce musical and abstract auditory hallucinations, often pleasant and complex.Dissociatives (ketamine, DXM, PCP) can generate immersive sonic environments, particularly during dissociative holes.Deliriants (diphenhydramine, datura) produce the most realistic and often disturbing auditory hallucinations — convincing phantom conversations and environmental sounds that are difficult to distinguish from reality.Cannabis at high doses, particularly edibles, can produce mild auditory hallucinations.Stimulant psychosis from prolonged use of amphetamines or cocaine can generate persecutory auditory hallucinations.
While psychedelic auditory hallucinations are generally benign and often enjoyable, deliriant-induced auditory hallucinations deserve serious caution — they can be indistinguishable from reality and may provoke dangerous behavioral responses. Stimulant-induced auditory hallucinations (especially persecutory voices) are a sign of psychosis and indicate a medical emergency requiring cessation of use and professional help. Individuals with a personal or family history of schizophrenia or psychotic disorders should exercise extreme caution with any substance that produces auditory hallucinations, as these effects may trigger or exacerbate underlying conditions. If hallucinated voices become commanding or frightening, this is a sign to seek immediate support.
Auditory hallucination can manifest at varying intensities depending on the dose of 4-HO-MET and individual sensitivity. The following levels describe the typical progression of this effect.
Vague, ambiguous sounds at the edge of perception — faint whispers, phantom notification sounds, or barely audible music that one cannot be sure is real.
Identifiable sounds with no source — distinct musical snippets, recognizable words or phrases, phantom environmental sounds like a ringing phone.
Clear and detailed auditory hallucinations — full melodies, conversational fragments, or rich environmental soundscapes; one can usually still distinguish them from reality.
Complex, vivid auditory experiences — entire songs with lyrics, coherent conversations, or immersive sonic environments that are difficult to distinguish from real sounds.
Complete auditory hallucination dominance — the hallucinated soundscape is indistinguishable from reality; real and imagined sounds merge into a single perceptual stream.
4-HO-MET's psychedelic effects are believed to come from its activity at the 5-HT2A receptor as a partial agonist. However, the role of these interactions and how they result in the psychedelic experience remains subject to on-going scientific investigation.
A large body of anecdotal reports suggests that the active dose can vary greatly. Some users report very heavy experiences with doses as low as 17mg, while others report light experiences with doses as high as 30 mg. Possible causes may be attributed to individual differences in neurochemistry and metabolism as well as variations in batch quality and physical forms (e.g. HCl vs. fumarate salt).
The experiences reported indicate hallucinatory states coming in waves of euphoria, swapping from moments of sobriety to intense visuals. Because 4-HO-MET is heavy on visuals and light on cognitive distress, it can be described as a recreational and practical alternative to psilocybin mushrooms, with thematic similarities in visual effects.
The toxicity and long-term health effects of recreational 4-HO-toxic dose is unknown. This is because 4-HO-MET is a research chemical with very little history of human usage. However, there are reports of very high doses leading to drug induced psychosis.
Anecdotal evidence from those who have tried 4-HO-MET 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.
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-MET presents cross-tolerance with Cross-all psychedelics, meaning that after the consumption of 4-HO-MET all psychedelics will have a reduced effect.
Austria: 4-HO-MET is illegal to possess, produce and sell under the NPSG (Neue-Psychoaktive-Substanzen-Gesetz Österreich).
Canada: 4-HO-MET is unscheduled in Canada.
Germany: 4-HO-MET is controlled under the NpSG (New Psychoactive Substances Act) as of July 18, 2019. Production and import with the aim to place it on the market, administration to another person, placing it on the market and trading is punishable. Possession is illegal but not punishable. The legislator considers it possible that orders of 4-HO-MET are punishable as an incitement to place it on the market.
Japan: 4-HO-MET is a controlled substance in Japan effective March 25th, 2015.
Poland:** 4-HO-MET is illegal to posses, manufacture and sell under "Wykaz środków odurzających i substancji psychotropowych" (Group I-P)
Sweden: Sveriges Riksdag added 4-HO-MET to Schedule I ("substances, plant materials and fungi which normally do not have medical use") as narcotics in Sweden as of May 1, 2012.
Switzerland: 4-HO-MET is a controlled substance specifically named under Verzeichnis E.
United Kingdom: 4-HO-MET is a Class A drug in the United Kingdom as a result of the tryptamine catch-all clause.
United States: 4-HO-MET is unscheduled in the United States. It may be considered an analogue of psilocin (4-HO-DMT), 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
4-HO-MET (Wikipedia)
4-HO-MET (Erowid Vault)
4-HO-MET (TiHKAL / Isomer Design)
Discussion
The Big & Dandy 4-HO-MET Thread (Bluelight)
Experienced community members who have extensively compared 4-HO-MET with related tryptamines (4-AcO-DMT, psilocybin mushrooms) consistently characterize 4-HO-MET as visually dominant with lighter cognitive load. Users with over 100 experiences report that set and setting produce far greater variation between individual trips than the chemical differences between closely related tryptamines, but that 4-HO-MET does consistently trend toward more visual and less emotionally heavy experiences.
Community reports confirm significant dose-response variability between individuals. Some users describe very heavy experiences at doses as low as 15-17 mg, while others report only light effects at 25-30 mg. This variability is attributed to differences in individual metabolism, neurochemistry, and the specific salt form used (HCl salt is reported to be more potent by weight than fumarate salt due to the difference in molecular weight of the salt portions).
Community members with cardiac conditions have expressed concern about the cardiovascular effects of 4-HO-MET and tryptamine psychedelics in general. One notable discussion involved a user whose partner had undergone open heart surgery and was interested in trying psychedelics. Community consensus was that individuals with significant cardiac history should consult with a cardiologist before using any tryptamine psychedelic, as the sympathomimetic effects (elevated heart rate and blood pressure) could pose genuine risk.
4-HO-MET can be administered via oral, smoked. The route of administration can influence both the onset and intensity of auditory hallucination.
The intensity of auditory hallucination depends heavily on the dose of 4-HO-MET. Effects like auditory hallucination are typically reported at common to strong doses. Below is the full dosage chart for 4-HO-MET.
Warning
Realistic auditory hallucinations, especially from deliriants or stimulant psychosis, can be indistinguishable from reality and may prompt dangerous behavior. Hearing commanding or persecutory voices is a sign of acute psychosis requiring immediate medical attention. Individuals with a history of psychotic disorders should avoid substances that produce this effect.
Yes. Auditory hallucination is a documented auditory effect of 4-HO-MET. Auditory hallucination is the perception of sounds that have no external source — hearing music, voices, environmental noises, or abstract sonic phenomena that exist entirely within the mind. These range from faint, ambiguous whispers at the edge of perception to fully formed, complex musical compositions or conversational speech that can feel completely real and externally sourced.
Effects like auditory hallucination are typically reported at common doses and above. A common oral dose of 4-HO-MET is 15–25 mg.
Other substances documented to produce auditory hallucination include Diphenhydramine, Datura, Dextromethorphan, Methamphetamine, Ibogaine, and 35 more.