A Manual for Reducing Harm

§ 00Why Harm Reduction

The abstinence message has had fifty years to work, and it has not. Every year, some number of people — curious, depressed, heartbroken, bored, spiritually starved — take psilocybin anyway. Telling them not to does not change that. Giving them accurate information about dose, context, contraindications, and what to do when things feel wrong can, and does, reduce the rate at which those experiences turn into emergencies.

That is harm reduction. It does not endorse psilocybin use. It assumes, correctly, that prohibition does not eliminate use, and it focuses its energy on keeping people alive and sane until policy catches up with reality.

§ 01Before You Use

Screen yourself honestly

Psilocybin can trigger or worsen certain mental-health conditions, particularly in people with a personal or family history of them. The following are widely treated as strong contraindications in clinical trials:

• Schizophrenia, schizoaffective disorder, or bipolar I
• A first-degree relative with any of the above (the genetic loading matters)
• Active psychosis, severe paranoia, or prior psychotic experiences
• Uncontrolled cardiovascular conditions
• Pregnancy or breastfeeding

These are not suggestions. In multi-site trials where screening has been rigorous, serious adverse events involving psychosis have been near-zero; in naturalistic settings without screening, they are not.

Medication interactions

Psilocybin acts on the serotonin system. That puts it in direct conversation with a large class of prescribed medications. Several of these combinations are dangerous; a few are fatal. The following list is not exhaustive, and your specific situation should be reviewed with a prescriber who understands your full regimen.

SSRIs and SNRIs are a separate case. They typically blunt the effect of psilocybin rather than make it dangerous, which is its own problem — people compensate by redosing, which is how overdoses (rarely fatal but frightening) happen. If you are tapering an SSRI with plans to use psilocybin, do so only under medical supervision and respect a multi-week washout.

The sober-day questions

Ask yourself, a week out, while sober: Why now? Running toward something (curiosity, an intention, a problem you want perspective on) tends to produce better experiences than running away from something (a breakup, a grief spike, a crisis). The latter is not forbidden, but it raises the bar for setting, sitter, and integration.

§ 02Set & Setting

Set is the mindset you bring — your mood that day, your trust in the people you are with, what you are hoping will happen, what you are afraid will happen. Setting is the physical and social environment — the room, the music, the weather, the people, the interruptions.

Timothy Leary introduced the terms; fifty years of clinical evidence has confirmed them. The single strongest predictor of whether an experience is difficult or generative is not dose — it is whether the person felt safe.

§ 03Dosing

The numbers below apply to dried Psilocybe cubensis, by weight, orally. Fresh mushrooms are roughly ten times heavier for the same psilocybin load. Potency varies significantly between strains, between flushes, and between caps and stems — a single batch is more consistent than two batches.

Start lower than you think. The difference between a 2g and a 3.5g experience is not 75% more intensity — it can be categorically different. You can always take more next time; you cannot take less once it is in you.

Most people eat dried mushrooms directly or grind them into tea with ginger (which reduces nausea). "Lemon-tekking" — steeping ground mushrooms in lemon juice for twenty minutes — shortens and intensifies onset, which is worth knowing, but is not recommended for a first experience.

§ 04The Arc of an Experience

For a moderate oral dose on a mostly-empty stomach:

• T+0 to T+30 min — nothing, then mild queasiness or warmth. Some people mistake this lull for "it didn't work" and redose; do not.
• T+30 to T+90 min — steep come-up. Textures begin to breathe, emotions come closer to the surface, the room feels different.
• T+90 min to T+3 hr — peak. This is where the experience is.
• T+3 to T+5 hr — descent; thinking returns; often a marked afterglow.
• T+5 to T+6 hr — close to baseline, though tired. Plan to sleep.

§ 05Trip Sitters

A sitter is a sober person whose job is to be present, not to intervene. Good sitters:

• Are sober for the duration
• Have experience with psychedelics themselves, or have read seriously about them
• Are someone the user already trusts — not a new friend, not a partner the user is currently fighting with
• Keep the room quiet, hand water when asked, do not narrate
• Intervene only for physical safety (preventing a fall, handling a panic episode) or for the "four questions" if things feel very off

A sitter is strongly recommended above 3g and required above 5g. Below that, a sober person in a nearby room with a knocked-on door is often enough.

§ 06Difficult Experiences

Most experienced users will tell you: there is no such thing as a bad trip, only a difficult one. Which sounds glib until you are in one, and then the framing matters. The single most reliable tool for handling a difficult experience is surrender: stop fighting, let what is happening happen, breathe.

When someone is struggling, a sitter can try the "four questions," in this order:

1. Do you want to change the lighting?
2. Do you want to change the music?
3. Do you want to change your position?
4. Do you want to change rooms?

Most spikes of distress respond to one of these. If someone is panicking, reminding them they took a mushroom, the feeling is temporary, and they are physically safe is often enough to let the wave pass. Waves is the right word: bad feeling does not usually build linearly; it crests and recedes. Waiting out one wave is often all that is needed.

§ 07Integration

The mushrooms wear off in six hours. The experience does not end there; it ends whenever you stop living differently because of it. That gap — between peak and lasting change — is integration, and it is the part most casual users skip.

Practical integration looks like:

• A journal entry within 24 hours, while detail is still available. Write as if to a stranger.
• A conversation with someone who can listen without trying to interpret — ideally a friend who has had their own experience, or an integration-oriented therapist.
• A specific behavioral change you want to try for two weeks. Not three; one.
• Tolerance for the possibility that the experience did not reveal anything earth-shaking, and that is fine.

Avoid immediate big life decisions. The afterglow reliably makes people feel clearer than they are; quitting a job or ending a relationship within 72 hours of a high-dose experience is a well-known regret pattern.

§ 08When To Seek Help

Seek a mental-health professional if you experience any of the following in the days or weeks following a psilocybin experience:

• Persistent derealization or depersonalization
• Intrusive flashbacks that disrupt daily function
• New or worsening depression, anxiety, or paranoia
• Thoughts of self-harm
• Inability to sleep for more than 48 hours

The Fireside Project (call or text 62-FIRESIDE) runs a free psychedelic peer support line staffed by trained volunteers. They do not report users, do not require demographic information, and exist precisely for during- and post-experience support.

§ 09Legal Context

As of 2026, psilocybin remains a Schedule I controlled substance under US federal law, meaning federal authorities classify it as having no accepted medical use and a high potential for abuse. Both of those claims are at odds with the clinical literature; the scheduling has not yet caught up.

At the state level, the landscape is fractured:

• Oregon (Measure 109, 2020) and Colorado (Proposition 122, 2022) have established regulated adult-use or therapeutic programs.
• Several cities — Denver, Oakland, Seattle, Washington DC, Somerville, Cambridge, Northampton, and others — have decriminalized personal possession, typically via local resolution directing police to deprioritize enforcement.
• Massachusetts, where this project is based, rejected the Natural Psychedelic Substances Act (Question 4) in November 2024. Personal possession, cultivation, and sale remain criminal offenses statewide, though three cities (Somerville, Cambridge, Northampton) have deprioritized local enforcement.
• In all other states, psilocybin possession remains criminalized.

This snapshot will go stale; verify your local law with a current source before acting on it. Harm reduction does not require that you use — it requires that, if you do, you understand the legal risk you are accepting.

§ 10Sources & Further Reading

• Johnson, M.W., Richards, W.A., & Griffiths, R.R. (2008). "Human hallucinogen research: guidelines for safety." Journal of Psychopharmacology, 22(6). The foundational clinical safety paper.
• Carbonaro, T.M. et al. (2016). "Survey study of challenging experiences after ingesting psilocybin mushrooms." Journal of Psychopharmacology, 30(12). Source of the "difficult but worthwhile" framing.
• MAPS — maps.org/psychedelic-harm-reduction
• Fireside Project — firesideproject.org / 62-FIRESIDE
• DanceSafe — dancesafe.org — testing kits and interaction charts
• Tripsit combo chart — wiki.tripsit.me/wiki/Drug_combinations