Safety and Screening
Is Psilocybin Safe? Side Effects, Screening, and How Oregon’s Rules Protect You
Side effects, who should not do this, what the screening asks, and what happens if a session gets hard.
Psilocybin is physically low-risk for most healthy adults and psychologically demanding for everyone. Psilocybin, the active compound in what most people call magic mushrooms, has low toxicity and no known addictive potential; the meaningful risks are a frightening experience, or destabilization in someone with certain histories. Oregon’s program manages that risk with mandatory screening, a licensed setting, a facilitator present the whole time, and three hard exclusions. Screening is where your safety is decided, and a facilitator who says “not yet” is doing the job well.
From Ayeterra’s Oregon-licensed facilitators. Last updated September 16, 2026.
What does the evidence say about psilocybin’s safety?
Two different questions hide in that one. Physically, psilocybin is among the safest psychoactive substances studied. Psychologically, it is powerful, and that is the whole point of screening.
Physical risk: low
- Low toxicity. No known lethal dose in humans at the amounts used in therapy or in Oregon’s program (maximum 50 mg per session)
- Not addictive. Psilocybin does not produce dependence; tolerance builds within days, which is the opposite of a craving cycle
- Temporary rises in heart rate and blood pressure for a few hours, which is why heart conditions get a conversation first
- Nausea in the first hour is common and passes; your facilitator plans for it
Psychological risk: real, and managed
- A frightening or overwhelming experience is possible at any dose and is the most common adverse event
- People with a history of psychosis or certain bipolar presentations can be destabilized, which is why Oregon excludes active psychosis outright
- Rarely, lasting perceptual changes (HPPD) have been reported, mostly with repeated unsupervised use
- A licensed setting, a facilitator present throughout, and careful screening are how these risks are held
In the peer-reviewed trials that Oregon’s model is built around, participants were screened, prepared, and supported before, during, and after their sessions. Under those conditions, serious adverse events were rare, and the most common difficult outcome was a hard session that resolved with support. Nobody in this work should tell you there is no risk. What they can tell you is what the risk is, who carries more of it, and what is done about it.
What are the side effects of psilocybin?
Most side effects are short, expected, and planned for. The ones that matter are psychological, and they are what the facilitator is there for.
During the session
- Nausea in the first hour, sometimes vomiting; eating lightly beforehand and a quiet start help
- Raised heart rate and blood pressure for a few hours, dilated pupils, a warm or chilled feeling
- Anxiety, fear, or confusion, especially as the dose comes on; this is the moment preparation is for
- Altered perception of time, sound, and color; that is the medicine working, not a side effect
After the session
- Fatigue and a headache the evening after; water and sleep
- Feeling tender, open, or unusually clear for a few days
- Rarely, lingering anxiety or low mood that wants a call to your facilitator, and a therapist if you have one
- Very rarely, lasting perceptual changes (HPPD), reported mostly after repeated unsupervised use
Who should not do psilocybin therapy?
Oregon draws three hard lines. Beyond those, some situations mean “not yet,” and some mean “talk to your doctor first.”
Oregon’s three exclusions
- Lithium taken within the last 30 days. Lithium combined with psychedelics is linked to seizures in case reports, and it is the one medication Oregon names
- A diagnosis of active psychosis at any time
- Current thoughts of harming yourself or others
Situations that mean a conversation first
- Bipolar disorder, especially bipolar I or a history of mania; many facilitators will decline, and the right answer depends on history and current care
- Heart conditions or uncontrolled high blood pressure, because of the temporary cardiovascular load
- Pregnancy or breastfeeding. There is no safety data, so the answer is no
- A first-degree relative with schizophrenia or psychosis, a recent major crisis, or an unstable living situation: all reasons to slow down, not necessarily to stop
Not sure whether something in your history is a problem? That is a consultation question, and it is free to ask.
Ask on a free consultationWhat about medications?
Bring every medication and supplement to screening, including the ones that seem unrelated. The rules of thumb, none of which replace a conversation with your prescriber:
- Lithium: a hard exclusion in Oregon. No session within 30 days of a dose.
- MAOIs: not an Oregon exclusion, but a real interaction risk; most facilitators will not proceed while you are on one.
- SSRIs and SNRIs: not an exclusion. They can blunt the effects of psilocybin, sometimes substantially. Whether to adjust anything is a decision for you and your prescriber, never for a facilitator, and no one at Ayeterra will suggest you stop a medication.
- Antipsychotics and mood stabilizers: usually mean the underlying history needs a closer look before anything else.
- Stimulants, benzodiazepines, tramadol, St. John’s Wort: each gets a conversation; some raise seizure or serotonin risk, some just dull the session.
- Blood pressure and heart medications: tell your facilitator, and if you have a cardiologist, tell them too.
Oregon rules bar facilitators from misrepresenting anything about psilocybin or their own qualifications (OAR 333-333-5120), and Ayeterra’s facilitators are not prescribers. What you will get is a clear account of what is known, a referral back to your doctor where it belongs, and a “not yet” if that is the honest answer.
What does the screening actually involve?
A standardized form and a private conversation with your facilitator, before any money changes hands.
Four parts, in order
- The Oregon client information form (OAR 333-333-5050): medical and mental health history, medications, substance use, support at home, and the three exclusion questions.
- A private conversation about what the form surfaced. This is where “not yet” or “with a support person” gets said, and why.
- A transportation plan (you cannot drive afterward) and, if the form calls for it, a client support person who will be there during the session.
- Informed consent and your client bill of rights, explained, and the fees in writing. Only then is anything booked.
Screening is not a test you pass. A person who is honest on the form and hears “let’s wait” has done exactly what the process exists for.
What keeps you safe during the session?
The setting
- A licensed service center with an emergency plan the state has reviewed (OAR 333-333-4460)
- Lab-tested psilocybin from an Oregon-licensed producer, the actual mushroom, nothing synthetic, at a dose you planned in preparation
- A private room for one-on-one sessions; groups capped at eight with Ayeterra
- No alcohol, cannabis, or other substances on site
Your facilitator
- Continuous monitoring by rule: visual and audio contact with you throughout, never by camera (OAR 333-333-5220)
- Trained to tell the difference between ordinary side effects and a medical emergency, and required to call for help if it is one
- Non-directive: there to keep you safe and let the experience be yours, not to steer it
- Supportive touch only with your prior written consent; no sexual contact, ever, with a one-year bar after services end
If the session gets hard, and it can, your facilitator’s job is to stay, to help you breathe, and to remind you that it passes. The hardest hour of a session is often the one people later describe as the most useful. Nobody is left alone with it.
Ask the safety questions out loud
The consultation is free and confidential, and it is exactly the place for your history, your medications, and your worries. You will get a straight answer, including “not yet” if that is the true one.
Book a free consultation Or call 503-713-5644 · Adults 21+What about afterward?
- You do not drive. A ride home is part of the transportation plan, and your facilitator will not release you to drive.
- The first evening is usually tired, tender, and clear. Rest, water, nothing big on the calendar.
- Your facilitator checks in within 72 hours, as Oregon requires, and integration support is part of every Ayeterra price.
- If something feels wrong in the days after, say so. Persistent anxiety, sleep trouble, or feeling unmoored are worth a call to your facilitator and, if you have one, your therapist.
- If you are in crisis at any point, call or text 988. Psilocybin services are not crisis care.
What does Oregon’s own data show?
Oregon publishes service center data. In the first quarter of 2025, 1,509 clients received psilocybin services in the state, and six behavioral, medical, or post-session reactions were reported (Oregon Health Authority, June 2025). That is the real-world rate under screening, a licensed setting, and a facilitator present: low, and not zero.
What the data cannot tell you is whether it is right for you. That is the consultation, and it is free.
Safety questions people ask
Can psilocybin therapy cause a psychotic episode?
In people with an existing vulnerability, yes, which is why Oregon excludes anyone ever diagnosed with active psychosis and why a family history of schizophrenia gets a careful conversation. In people without that vulnerability, the trial evidence shows it is rare. Screening exists to find the difference before a session, not after.
What if I have a bad trip?
It happens, at every dose, and your facilitator is trained for it. Difficult experiences are the most common adverse event and they resolve with support: breath, presence, a steady voice, sometimes just time. Preparation covers what to do if it gets big, and you will not be alone for any of it.
Is it safe to take psilocybin with SSRIs or other antidepressants?
Most SSRIs and SNRIs are not dangerous with psilocybin, but they can blunt the effect, sometimes a lot. Oregon does not require you to stop them and neither does Ayeterra. Any change to a medication is between you and your prescriber. Lithium is different: it is an Oregon exclusion and a real risk.
Can I do this if I have a heart condition?
Sometimes, with your doctor’s input. Psilocybin raises heart rate and blood pressure for a few hours, so uncontrolled hypertension, recent cardiac events, or arrhythmias mean a conversation with your cardiologist before a facilitator can say yes.
Is the psilocybin itself safe? Where does it come from?
It is the actual mushroom, Psilocybe cubensis, grown in Oregon by state-licensed producers and tested by an Oregon-licensed lab for potency and contaminants before it can be sold. Nothing synthetic is allowed, and nothing can be added that alters potency or duration. You buy it at the service center and take it there.
Can you overdose on psilocybin?
A fatal overdose from psilocybin mushrooms is essentially unknown; the estimated lethal dose is hundreds of times a therapeutic dose. What people call an overdose is usually a frightening, overwhelming experience, which is real, distressing, and not dangerous to the body. In Oregon the maximum is 50 mg per session, doses are planned in preparation, and a facilitator is present the whole time.
Can I get addicted?
No. Psilocybin does not produce dependence, and tolerance builds so fast that back-to-back use stops working within days. Oregon’s program also spaces sessions by design.
Is psilocybin therapy safe near me, at any licensed center in Oregon?
Every licensed Oregon service center works under the same rules: screening, a facilitator present throughout, an emergency plan, tested product. What varies is how much preparation you get and how willing the screening is to say no. Ask any center you consider how many preparation sessions are included and when they last told someone “not yet.”
What does Ayeterra do differently on safety?
Preparation beyond the state minimum, one facilitator with you from start to finish, groups capped at eight, and screening that will say no. With your consent, coordination with a therapist you already see, which matters most for the people carrying the most.
Start with a frank conversation
Free, confidential, and no commitment. Bring your history and your questions. You will leave knowing whether this is safe for you, and when.
Book a free consultation Or call 503-713-5644 · Adults 21+Oregon Health Authority, June 12, 2025. Oregon Psilocybin Services publishes interactive data dashboard: 1,509 clients served January to April 2025; six behavioral, medical, or post-session reactions reported.
OAR 333-333-4460 (Service center emergency plan); 333-333-5120(4) (facilitator must distinguish side effects from medical emergencies and contact emergency responders); 333-333-5120(9) and (10) (no sexual contact, one-year bar); 333-333-2050 (no additives that alter potency or duration, including MAOIs). Oregon Health Authority.
Johnson MW, Griffiths RR, Hendricks PS, Henningfield JE. The abuse potential of medical psilocybin according to the 8 factors of the Controlled Substances Act. Neuropharmacology. 2018;142:143-166 (low toxicity, low dependence potential).
Nayak SM, Gukasyan N, Barrett FS, Erowid E, Erowid F, Griffiths RR. Classic psychedelic coadministration with lithium, but not lamotrigine, is associated with seizures. Pharmacopsychiatry. 2021;54(5):240-245.
Carbonaro TM, Bradstreet MP, Barrett FS, et al. Survey study of challenging experiences after ingesting psilocybin mushrooms. Journal of Psychopharmacology. 2016;30(12):1268-1278.
Oregon Health Authority, Oregon Psilocybin Services. Access Psilocybin Services: eligibility criteria (lithium within 30 days, active psychosis, ideation of harm), preparation, administration, and integration sessions, 72-hour follow-up. oregon.gov/oha/ph/preventionwellness/pages/psilocybin-access-psilocybin-services.aspx
OAR 333-333-5000 (Preparation Session Requirements), 333-333-5050 (Client Information Form), 333-333-5120 (Facilitator Conduct), 333-333-5220 (Administration Session Requirements, continuous monitoring), 333-333-5250 (Duration of Administration Session), 333-333-2015 (Psilocybe cubensis only). Oregon Health Authority.
Ayeterra provides legal psilocybin facilitation in Oregon through facilitators licensed by the State of Oregon, under Oregon’s regulated psilocybin program. These services are not medical care, psychotherapy, or a substitute for diagnosis or treatment by a licensed medical or mental health professional, and anything we share is general education, not medical advice. Psilocybin is not right for everyone: participation is limited to adults 21 and over and involves screening. We do not promise specific outcomes, and experiences vary. If you are in crisis or thinking about harming yourself, call or text 988. Psilocybin services are not a substitute for crisis care or treatment.
Last updated September 16, 2026