Are magic mushrooms safe? What the evidence says about the risks

“Safe” can mean several things: will it harm my body, will it harm my mind, what if I have a health condition, and what if the mushroom is not what I think it is. The evidence differs for each. This guide takes them one at a time, says how strong the evidence is for each risk, and says plainly what nobody knows yet.

In short, the sources we opened do not describe magic mushrooms as risk-free. They also do not describe them as a source of heavy physical toxicity. A 2008 safety review by Johns Hopkins researchers calls hallucinogens relatively safe physiologically but says they carry unique psychological risks (Johnson et al., 2008). Health Canada lists a wider set of effects and warns that some groups face higher risk (Health Canada).

How strong is the evidence on magic mushroom safety?

We label each risk. Established: official Canadian sources and published reviews agree. Preliminary: one study, or a small or self-selected sample. Unresolved: studies disagree or the question has not been answered. Limited evidence: we could open only a thin or old source.

One caution applies to everything below. Much of the safety research on psilocybin comes from clinical studies that screen volunteers, prepare them and supervise sessions. A 2022 review says that serious harms in such settings are rare, and that the risks are greater when drugs are used unsupervised (Schlag et al., 2022). Those studies do not describe what happens to a person who eats mushrooms of unknown identity and strength at a party.

What are the psychological risks of magic mushrooms?

Health Canada lists hallucinations that distort a person’s sense of reality, anxiety and panic attacks, confusion and disorientation, and fear or paranoia. It says a “bad trip” can be frightening, with paranoia, loss of boundaries and a distorted sense of self (Health Canada). Evidence: established.

The Johns Hopkins review calls overwhelming distress, the “bad trip”, the most likely risk, and says it could lead to dangerous behaviour such as leaving the place where a person is being watched over (Johnson et al., 2008). CAMH adds that hallucinogens may leave people disoriented, with poor judgment and a tendency to take risks (CAMH). Evidence: established.

How often do people need emergency care?

Rarely, in the one large survey we found. A 2022 analysis of 9,233 past-year users of psilocybin mushrooms in the 2017 Global Drug Survey found 19 (0.2%) had sought emergency treatment. Anxiety, panic, paranoia and suspiciousness were the most reported problems, young age was the only predictor of emergency care, and all but one of those respondents returned to normal within 24 hours. The authors named poor “mindset”, poor “setting” and mixing substances as the most reported reasons for incidents (Kopra et al., 2022). Evidence: preliminary. The sample chose to answer an online survey, so it may not match everyone who uses mushrooms.

What about flashbacks and lasting effects?

Health Canada and CAMH both say flashbacks, replays of the experience, can occur (Health Canada; CAMH). CAMH says they are rare and can come days, weeks or even years later, and that some people feel depressed or anxious long after taking a hallucinogen. That page carries a 2004 and 2009 copyright, so treat it as a general overview, not current data.

How often a lasting, distressing form (hallucinogen persisting perception disorder, or HPPD) occurs is disputed. The 2008 review says its incidence is unknown but thought to be very uncommon (Johnson et al., 2008). The 2022 review notes a figure of 4.2% of hallucinogen users from a single online questionnaire, and much lower rates in other work, some as low as 1 in 50,000 (Schlag et al., 2022). Evidence: unresolved.

Can magic mushrooms trigger psychosis?

Rarely, but the numbers are uncertain, and some people face higher risk. Health Canada says people predisposed to or living with psychiatric conditions may face an elevated risk of side effects (Health Canada). The 2008 review describes prolonged psychoses triggered by hallucinogens as less common than bad trips, and recommends excluding research volunteers with a personal or family history of psychotic disorders (Johnson et al., 2008).

Counts vary with the kind of study. A 2025 meta-analysis covering LSD, psilocybin, mescaline, DMT and MDMA together put psychedelic-induced psychosis at 0.002% in population studies, 0.2% in uncontrolled trials and 0.6% in randomised trials. Among uncontrolled trials that included people with schizophrenia, 3.8% developed long-lasting psychotic symptoms (Sabé et al., 2025). These figures are pooled across several psychedelics, not psilocybin alone, so they are not a psilocybin-specific rate. Most of the studies the authors analysed were low quality, and they call for more high-quality research and a conservative approach until then.

One survey cited in the 2022 review found prolonged psychotic symptoms linked to the experience in 0.15% of respondents, but that study deliberately sought people who had a negative experience (Schlag et al., 2022). Evidence: preliminary, and whether a drug causes a psychosis or only brings forward an existing one is not settled here. We give the topic its own page: can magic mushrooms cause psychosis?

What are the physical effects and risks?

Health Canada lists increased heart rate and blood pressure, muscle weakness, twitching or convulsions, nausea and vomiting, loss of urinary control, numbness, sweating and high body temperature (Health Canada). The 2008 review likewise lists dizziness, tremors, nausea, blurred vision and dilated pupils, and says hallucinogens can moderately raise pulse and blood pressure (Johnson et al., 2008). Evidence: established.

The same review says hallucinogens generally have low physiological toxicity and have not been shown to cause organ damage or neuropsychological deficits, and that the main safety concerns are psychological rather than physiological (Johnson et al., 2008). The 2022 review reaches a similar view, adding that overdose deaths have followed very large doses (the example given is LSD) or mixing psychedelics with other drugs and alcohol. It cites data for England and Wales from 1993 to 2020 with two deaths where psilocybin was mentioned on a death certificate (Schlag et al., 2022). Evidence: established for low toxicity, though a registry count is not a measure of risk to an individual. We cover that question in can you overdose on magic mushrooms?

Rare serious cases exist. Health Canada notes case reports in the literature of serious harms from intravenous injection of mushrooms, including septic shock and multi-system organ failure (Health Canada). A case report by Ontario-based authors, two of them affiliated with the Ontario Poison Centre, describes a 15-year-old with acute kidney injury 36 hours after eating Psilocybe cubensis, confirmed by mass spectrometry to contain psilocin; his kidney function fully recovered (Austin et al., 2019). Evidence: limited. The authors call it the first reported case, so it shows what can happen, not how often.

Who is at higher risk from magic mushrooms?

Sources we opened name several groups. The table keeps to what they say and how strong the evidence is. It is not a screening tool, and its absence from a row does not mean someone is not at risk.

On pregnancy, the 2026 review is explicit: no eligible primary human outcome studies for psilocybin were found, and “absence of data … should not be interpreted as evidence of safety” (Albert and Arthur, 2026). CAMH’s warning (CAMH) is a general one about hallucinogens, not psilocybin results. Anyone who is pregnant or may be should speak to a health professional.

Do magic mushrooms interact with medications and other drugs?

The honest answer is that the evidence is thin and mostly indirect. The 2008 review lists drugs that earlier studies of hallucinogens found to strengthen hallucinogen effects: lithium and tricyclic antidepressants with chronic use, and serotonin reuptake inhibitors and the antipsychotic haloperidol with acute use. It also lists drugs found to weaken them: chronic SSRIs and MAO inhibitors. It advises research teams to exclude people taking these, and also those taking supplements such as 5-hydroxytryptophan or St. John’s wort (Johnson et al., 2008). Evidence: limited (a research-screening list drawn from older studies, not personal advice).

The 2022 review reports that in one ayahuasca study no difference in adverse effects was found between people who used antidepressants and those who did not. It also notes that ayahuasca, which contains MAO inhibitors, combined with SSRIs has the potential to lead to serotonin syndrome (Schlag et al., 2022). Ayahuasca is a different preparation, so neither point maps straight onto mushrooms. Evidence: unresolved. Never stop or change a prescribed medicine because of anything you read here: talk to the prescriber or a pharmacist. We discuss one common case in magic mushrooms and antidepressants.

For other substances, Health Canada is blunt: combining magic mushrooms with cannabis, amphetamines, alcohol and similar drugs elevates the risks (Health Canada). The 2022 review makes the same point, that risks rise substantially when drugs are mixed (Schlag et al., 2022). Evidence: established.

Can you mistake a poisonous mushroom for a magic mushroom?

Yes, and the official sources stress it. Health Canada says many species look alike, so it can be hard to tell them apart, and it is possible to eat poisonous mushrooms by mistake (Health Canada). CAMH says hallucinogenic plants can be mistaken for other toxic or lethal ones, mushrooms included (CAMH). Evidence: established.

The Ontario Poison Centre states that poisonous and non-poisonous mushrooms grow beside each other, that only a mycologist can tell the difference, and that eating even small parts of some mushrooms can cause sickness or death. It adds that illness may not start for many hours, that cooking does not make wild mushrooms safe, and that anyone who has eaten wild mushrooms should call before feeling sick (Ontario Poison Centre).

The danger is not hypothetical. Some Galerina species, small brown mushrooms, contain amatoxins at levels equal to those in the death cap, and a study of 70 samples collected in western British Columbia found them in all 24 samples of the G. marginata complex (Landry et al., 2021). Naming is hard even for collections: a 2022 DNA study found that the taxonomic accuracy of specimen names in museum collections was largely unreliable, even at genus level (Bradshaw et al., 2022). Evidence: established. We do not offer identification tips, because a text cannot make a mushroom safe; our guide to why a name or a photo can’t clear a mushroom, and who to call explains the limits. Why colour is no test is explained in why magic mushrooms turn blue.

Strength is a second unknown. Health Canada says the strength of magic mushrooms can vary greatly, so one mushroom may contain different concentrations of active ingredients from another (Health Canada). The DNA study also found that psilocybin and psilocin decay over time in some specimens, with some having none detectable (Bradshaw et al., 2022).

Is it safe to drive on magic mushrooms?

No source we opened says so, and several point the other way. CAMH says hallucinogens can leave people disoriented with poor judgment (CAMH), and the 2008 review gives driving while impaired as an example of a hazardous pattern of use (Johnson et al., 2008). Evidence: established.

Canadian law does not name psilocybin here, and it does not need to. The Criminal Code offence of operation while impaired covers a person whose ability to operate a conveyance is impaired to any degree by alcohol or a drug or by a combination of alcohol and a drug (Criminal Code, s. 320.14, current to 21 September 2026 when read). We found no official source giving a time after which driving is safe, so we do not give one. For the wider legal position, see are magic mushrooms legal in Canada?

Where can you get help in Canada?

• Emergency: 911. The CAPCC site says to call 911 if the person is unconscious, not breathing or having a seizure (CAPCC). Separately, Health Canada’s Good Samaritan Drug Overdose Act page says the Act provides some legal protection for people who experience or witness an overdose and call 911 or their local emergency number, including against certain simple-possession charges; it does not protect against production or trafficking charges (Government of Canada).
• Possible poisoning, including mushrooms, in Ontario: the Ontario Poison Centre on 1-800-268-9017 (toll-free in Ontario) or 1-844-POISON-X (1-844-764-7669), or (416) 813-5900 in the Greater Toronto Area. The centre says it is available by phone 24 hours a day, every day of the year (Ontario Poison Centre; CAPCC Ontario page).
• Elsewhere in Canada: Health Canada says 1-844 POISON-X (1-844-764-7669) routes callers to their local poison centre, and Quebec keeps its own number, 1-800-463-5060 (Health Canada, 2023). In Nunavut the CAPCC tells the public to contact their local health centre (CAPCC).
• Suicide crisis: 9-8-8, the Suicide Crisis Helpline, which you can call or text, 24 hours a day, every day of the year, with its website in English and French. The site also says to call 9-1-1 right away if your safety is at risk (9-8-8).
• Support after a difficult experience: CAMH’s page lists CAMH Access (416-535-8501, press 2), ConnexOntario and Kids Help Phone (1-800-668-6868) (CAMH). These are support and treatment-access lines, not emergency services.

For what official sources say to do when someone seems to be in distress, read how to help someone having a bad trip. For practical safety information we point to our safety page, not to this article.

What is still not known about magic mushroom safety?

• How often serious psychological harm occurs outside research settings. Most counts come from clinical studies, surveys of people who chose to respond, or case reports.
• Whether rare events such as psychosis or long-lasting perceptual changes are caused by psilocybin, brought forward by it, or only coincide with it.
• Which medications interact with psilocybin in practice. Much of the evidence is older, and some of it concerns LSD or ayahuasca.
• Pregnancy and breastfeeding: we found no eligible human outcome studies for psilocybin in pregnancy, and we did not look for data on breastfeeding.
• Canadian numbers. We could not open a Canadian Drug Summary for psilocybin or published Canadian poison-centre counts for psilocybin mushrooms, so we do not report any.

None of this makes a risk smaller because it is unmeasured. If you have a health condition, take medication, are pregnant or are unsure what a mushroom is, the sources agree that the sensible step is to talk to a health professional or poison centre first.

Shroomverse sells mushroom products. This article is general information about what official sources and research say about safety. It is not medical, legal or purchasing advice, and it does not encourage anyone to use drugs.