A. muscaria mushrooms in different stages of growth.
|Common names||Fly agaric, Fly amanita|
|Active constituents||Muscimol, Ibotenic acid|
Amanita muscaria (also known as fly agaric or fly amanita) is a psychoactive mushroom that grows widely in the northern hemisphere. The fly agaric is a large white-gilled, white-spotted, usually red mushroom that is one of the most recognizable and widely encountered in popular culture. It is noted for its hallucinogenic properties, which derive from its primary psychoactive constituents ibotenic acid and muscimol. Muscimol is a potent, selective agonist for the GABAA receptor that produces sedative, depressant and deliriant effects.
Although classified as poisonous, reports of human deaths resulting from its ingestion are extremely rare. After parboiling—which weakens its toxicity and breaks down the mushroom's psychoactive substances—it is eaten in parts of Europe, Asia, and North America.
Amanita muscaria has been used as an intoxicant and entheogen by the peoples of Siberia, and has a religious significance in these cultures. In western Siberia, the use of A. muscaria was restricted to shamans, who used it as an alternative method of achieving a trance state. In eastern Siberia, A. muscaria was used by both shamans and laypeople alike, and was used recreationally as well as religiously.
There has been much speculation on possible traditional use of this mushroom as an intoxicant in other places such as the Middle East, Eurasia, North America, and Scandinavia.
In remote areas of Lithuania, Amanita muscaria has been reported to be consumed at wedding feasts. The Lithuanians have also been reported to export the mushrooms to the Lapps in the Far North for use in shamanic rituals.
Amanita muscaria is sometimes confused with psilocybin mushrooms as "magic mushrooms". However, these two mushrooms have completely different active compounds, pharmacological effects, and appearances.
Amanita muscaria has formed a symbiotic relationship with various coniferous and deciduous trees such as birches, pines, and spruces, and can often be found growing near them. There are many different varieties of amanita muscaria with varying appearances.
The principle psychoactive compounds in amanita muscaria are muscimol and the related compound ibotenic acid. Both compounds have similar molecular structures; however, ibotenic acid contains a carboxyl group. Both compounds contain an isoxazole ring with a hydroxyl group bonded at the 3-position. Unlike muscimol, ibotenic acid is a non-selective glutamate receptor agonist, which contributes to its relatively powerful neurotoxic effects. Ibotenic acid is also decarboxylated to muscimol.
Amanita muscaria also contains small amounts of muscarine, a non-selective muscarinic acetylcholine receptor agonist. While this was once thought to be the principle mechanism of action of amanita muscaria, it is no longer thought to be since the levels of muscarine are too low to be significant.
Muscimol has an atypical mechanism of action. Unlike classical psychedelics (which are 5-HT2A agonists) and classical dissociatives (which are NMDA receptor antagonists), muscimol is a potent GABAA agonist, meaning it activates the receptor for GABA, the brain's principle inhibitory neurotransmitter. As an agonist, muscimol binds to the same site on the GABAA receptor as GABA itself. This is unlike benzodiazepines and barbiturates, which bind to different allosteric sites on the GABAA receptor.
Muscimol has also been shown to be a partial agonist at the GABAA-ρ receptor, which may contribute to its psychoactive effects. Some substances that interact with the GABAA receptor such as zolpidem have been shown to also have hallucinogenic effects.
Ibotenic acid has been shown to be a potent NMDA agonist as well as a powerful agonist at the group I and group II metabotropic glutamate receptors. Due to in vivo decarboxylation, ibotenic acid is metabolized to muscimol and thus has many similar pharmacological characteristics.
Toxicity and harm potential
Disclaimer: The effects listed below cite the Subjective Effect Index (SEI), a research literature based on anecdotal reports and the personal experiences of PsychonautWiki contributors. As a result, they should be regarded with a healthy degree of skepticism. It is worth noting that 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. Likewise, adverse effects become much more likely with higher doses and may include addiction, serious injury, or death.
- Sedation - Many users report mild to extreme sedation and even sleepiness while under the influence of amanitas.
- Stimulation - While most users report sedation and a lack of energy, some users also report a relatively intense stimulation.
- Spontaneous physical sensations
- Pain relief - Many users report a marked decrease in pain while under the influence.
- Muscle relaxation
- Muscle spasms
- Increased perspiration
- Pupil constriction
- Increased salivation
- Colour shifting
- After images
- Depth perception distortions
- Perspective distortions
- External hallucination (autonomous entities; settings, sceneries, and landscapes; perspective hallucinations and scenarios and plots)
- Internal hallucination (autonomous entities; settings, sceneries, and landscapes; perspective hallucinations and scenarios and plots)
- Peripheral information misinterpretation
- Analysis enhancement
- Consciousness disconnection: Many users report a distinct dissociation from their surroundings while on Amanita muscaria.
- Cognitive euphoria - This results in feelings of physical euphoria which range between mild pleasure to powerfully all-encompassing bliss.
- Decreased libido or Increased libido - Many users of amanitas report to experience a noticeable decrease in libido while others report the opposite.
- Dream potentiation - Because of the sedating nature of Amanita muscaria, many people fall asleep before the prominent effects take effect. These individuals report extremely vivid and often lucid dreams.
- Empathy, love, and sociability enhancement - While this effect is less powerful than that of MDMA or MDA, it is still prominent.
- Sleepiness - As a GABAA agonist, the muscimol in Amanita muscaria can make people extremely drowsy.
- Unity and interconnectedness - While this effect is less powerful than that of MDMA or MDA, it is still prominent.
- Existential self-realization
- Immersion enhancement
- Increased music appreciation
- Analysis suppression
- Memory suppression
Anecdotal reports which describe the effects of this compound within our experience index include:
Additional experience reports can be found here:
Hunting psychoactive mushrooms in nature can be very dangerous.
Caution is advised because poisonous or deadly mushrooms can easily be mistaken for edible ones.
Toxicity and harm potential
This toxicity and harm potential section is a stub.
As a result, it may contain incomplete or even dangerously wrong information. You can help by expanding upon or correcting it.
Since muscimol and ibotenic acid are GABAA agonists, it may be harmful to combine it with other GABAergic depressants such as benzodiazepines or barbiturates. Ibotenic acid is also known to be a neurotoxin, acting via the NMDA receptor and metabotropic glutamate receptor. It is wise to dry amanita muscarias in the oven or purchase pre-dried amanitas to ensure the ibotenic acid concentration is as low as possible.
One of the major dangers of amanita muscaria is misidentifying it as a different species of mushroom. Several other mushrooms in the genus amanita are toxic. One such mushroom, the amanita phalloides, better known as the death cap, contains α-amanitin and β-Amanitin, both of which are extremely potent RNA polymerase II and RNA polymerase III inhibitors which damage virtually every tissue in the body. As the name suggests, the amanita muscaria contains the chemical muscarine, a muscarinic acetylcholine agonist which is known to cause seizures; however, the mushroom contains very low amounts that are highly unlikely to pose any significant harm.
Amanita muscaria mushrooms are not known to be addictive or dependence-forming, and reports even show that desire to redose goes down with usage, though there is no research on this topic.
It is strongly recommended that one use harm reduction practices when using this substance.
Amanita muscaria grows naturally and is legal to grow, sell and consume in most parts of the world. It is, however, restricted in some countries.
- Australia: The muscimol present in amanita muscaria is considered a Schedule 9 prohibited substance in Australia under the Poisons Standard (October 2015). A Schedule 9 substance is a substance which may be abused or misused and the manufacture, possession, sale or use of is prohibited by law except when required for medical or scientific research, or for analytical, teaching or training purposes with approval of Commonwealth and/or State or Territory Health Authorities.
- Netherlands: Amanita muscaria and amanita pantherina are illegal to buy, sell, or possess since December 2008. Possession of amounts larger than 0.5 g dried or 5 g fresh lead to a criminal charge.
- United Kingdom: It is illegal to produce, supply, or import this drug under the Psychoactive Substance Act, which came into effect on May 26th, 2016.
- Frølund, B; Ebert, B; Kristiansen, U; Liljefors, T; Krogsgaard-Larsen, P (2002). "GABA-A receptor ligands and their therapeutic potentials". Current Topics in Medicinal Chemistry. 2 (8): 817–32. doi:10.2174/1568026023393525. PMID 12171573
- Rubel, W.; Arora, D. (2008). "A Study of Cultural Bias in Field Guide Determinations of Mushroom Edibility Using the Iconic Mushroom, Amanita Muscaria,as an Example" (PDF). Economic Botany. 62 (3): 223–43. doi:10.1007/s12231-008-9040-9.
- Nyberg, H. (1992). "Religious use of hallucinogenic fungi: A comparison between Siberian and Mesoamerican Cultures" (PDF). Karstenia. 32 (71–80): 71–80. doi:10.29203/ka.1992.294.
- Wasson, R. Gordon (1980). The Wondrous Mushroom: Mycolatry in Mesoamerica. McGraw-Hill. ISBN 978-0-07-068443-0.
- Fuhrer BA. (2005). A field guide to Australian fungi. Melbourne: Bloomings Books. p. 24.
- "Poisons Standard October 2015". Federal Register of Legislation.
- "wetten.nl - Regeling - Opiumwet - BWBR0001941". wetten.overheid.nl (in Dutch).
- Psychoactive Substances Act 2016 (Legislation.gov.uk) | http://www.legislation.gov.uk/ukpga/2016/2/contents/enacted