4-AcO-DMT
4-AcO-DMT is a synthetic psychedelic tryptamine, also known as psilacetin or O-acetylpsilocin. It is chemically related to psilocin and is generally described as a prodrug that can be converted into psilocin. Research in people is limited, so its effects, risks, and legal status should not be assumed to match those of mushrooms.
- Type
- Synthetic tryptamine psychedelic
- Related to
- Psilocin and psilocybin
- Often described
- As a psilocin prodrug
- Human research
- Limited; effects remain uncertain
- Legal status
- Depends on jurisdiction and circumstances
What is 4-AcO-DMT?
4-AcO-DMT is short for 4-acetoxy-N,N-dimethyltryptamine, a lab-made compound in the tryptamine family. It is also called psilacetin or O-acetylpsilocin. Its structure is related to psilocin, the psychoactive compound associated with psilocybin mushrooms, but the molecules are not identical. In 4-AcO-DMT, an acetyl group is attached where psilocin has a hydroxyl group. That chemical difference is why it is described as an ester derivative of psilocin.
The name can cause confusion because 4-AcO-DMT is not a mushroom species, mushroom extract, or another name for psilocybin. It is a distinct synthetic chemical. Researchers have studied it as a possible prodrug: a compound that is converted in the body into another active compound. That description is supported by animal research and laboratory findings, but detailed studies of its effects and processing in people remain limited.
- 1Compound present
4-AcO-DMT enters biological tissue; human processing is not fully characterized.
- 2Enzymes act
Esterase enzymes can cleave the molecule’s acetyl group.
- 3Psilocin forms
The conversion produces psilocin, according to laboratory and animal findings.
- 4Receptors interact
Psilocin interacts with serotonin receptors, including 5-HT2A.
How does 4-AcO-DMT relate to psilocin?
A prodrug is transformed by the body after it is present in biological tissue. In the case of 4-AcO-DMT, enzymes called esterases can remove the acetyl group, producing psilocin. A laboratory study using human plasma found rapid conversion under its test conditions. That result helps explain the prodrug idea, but a test-tube result does not establish exactly how the compound behaves in every person or situation.
Psilocin interacts with several serotonin receptors, including the 5-HT2A receptor, which is strongly associated with psychedelic effects. Because 4-AcO-DMT can be converted to psilocin, researchers expect its effects to be related to psilocin’s activity. That does not make the compounds interchangeable: conversion, exposure, and effects may differ, and human evidence is not sufficient to predict an individual response. Reports from users are not a substitute for controlled clinical research.
4-AcO-DMT is described as a synthetic compound.
Evidence indicates conversion to psilocin, though human details are limited.
Human research on 4-AcO-DMT remains sparse.
Editorial placement to help compare; not a measurement.
Why does 4-AcO-DMT matter, and where is it found?
Scientists have taken interest in 4-AcO-DMT because it is chemically related to psilocybin and may be useful in research on psychedelic compounds. Its history includes a 1963 patent and later work on its synthesis for research purposes. It was identified as a designer drug in Europe in 2009 and became more visible in recreational settings in later years. These milestones describe its history, not proof that it is safe or approved for human use.
In the United States, the name has also appeared in discussion of products sold as mushroom edibles, including gummies and chocolates. Such products may contain 4-AcO-DMT, Amanita-derived ingredients, or other substances; the name or packaging alone cannot confirm what is inside. Product contents and labeling can be unreliable. For a glossary reader, the key distinction is that a product marketed as a mushroom item may not contain psilocybin mushrooms at all.
| 4-AcO-DMT | Psilocin | Psilocybin | |
|---|---|---|---|
| Compound type | Synthetic ester derivative | Psychoactive tryptamine | Mushroom-produced compound |
| Relationship | Can convert to psilocin | Possible conversion product | Can convert to psilocin |
| Source | Made synthetically | Occurs in mushrooms | Occurs in certain mushrooms |
| Research | Limited human evidence | Studied as an active compound | Studied in clinical research |
What are common misconceptions and safety concerns?
One misconception is that 4-AcO-DMT is simply synthetic psilocybin or that it must produce the same experience as mushrooms. It is a separate compound, and claims that its effects are identical or reliably gentler are not established by strong human studies. Another misconception is that a product’s mushroom branding confirms its ingredients. Without trustworthy testing, consumers may not know which substances are present or in what amounts.
There is not enough human research to define 4-AcO-DMT’s safety profile or to show that it is safer than psilocybin. Reports describe psychological and physical adverse effects, but individual outcomes cannot be predicted from anecdotes. Psilocybin is federally Schedule I in the United States; supervised access exists through state programs in Oregon and Colorado, while New Mexico’s medical program is being set up. Those programs do not automatically authorize 4-AcO-DMT. Laws vary, and federal analogue rules may be relevant; check current law.
- 1963
A patent covering 4-AcO-DMT and related psilocin esters was filed.
- 1999
David E. Nichols and colleagues reported improved synthesis work and research interest.
- 2009
4-AcO-DMT was first identified as a designer drug in Europe.
How does 4-AcO-DMT connect to mushroom science?
The most useful comparisons are with psilocin and psilocybin. Psilocin is the compound 4-AcO-DMT may convert into; psilocybin is a naturally occurring mushroom compound that the body can convert into psilocin. Their chemistry and legal treatment differ. Psilocybin research often concerns standardized compounds or carefully controlled settings, so its findings should not automatically be applied to 4-AcO-DMT or to unregulated products.
The term also connects to broader topics such as tryptamines, serotonin receptors, psychedelic research, and mushroom-product labeling. It is a chemical name, not a mushroom-identification clue: it cannot help identify a wild specimen. Never eat a wild mushroom without expert identification. When reading about any psychoactive compound, separate laboratory findings, clinical research, legal rules, and personal reports; each type of information answers different questions and has different limits.
Common questions about 4-AcO-DMT
What does 4-AcO-DMT stand for?
It is an abbreviation for 4-acetoxy-N,N-dimethyltryptamine. The compound is also called psilacetin or O-acetylpsilocin. These names refer to a synthetic tryptamine related to psilocin, not to a mushroom species or a synonym for psilocybin.
Is 4-AcO-DMT the same as psilocybin?
No. They are different chemicals. 4-AcO-DMT is a synthetic ester that may be converted into psilocin, while psilocybin is a compound found in some mushrooms and can also be converted into psilocin. Similarities in this pathway do not establish identical effects, risks, or legal status.
Is 4-AcO-DMT legal in the United States?
Its legal status can depend on jurisdiction and circumstances, and federal analogue laws may be relevant. It should not be assumed to have the same status as psilocybin or to be authorized by state psilocybin programs. Psilocybin remains federally Schedule I; check current federal and state rules for legal guidance.
Do mushroom gummies contain 4-AcO-DMT?
Some products marketed as mushroom edibles may contain 4-AcO-DMT, while others may contain Amanita-derived ingredients or different substances. A product name or label cannot reliably establish its contents. Reports of adverse effects and uncertain labeling make it important not to treat these products as equivalent to identified mushrooms.
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Written by the Pscilly editorial team and reviewed November 2026. Educational content only, not medical or legal advice. Pscilly does not sell psilocybin. Never eat a wild mushroom without expert identification.