Psilocybin Effects and Duration
Plain-language summary
After someone swallows psilocybin, effects usually start within an hour. They peak near the middle and fade over about six hours. Effects touch both the body and the mind. They can include changes in sight, mood, and sense of time. Higher doses tend to bring stronger effects. Many people feel tired or thoughtful for a day or two after.
Onset, peak, and duration timeline
A psilocybin experience follows a rough curve. It builds up, reaches a high point, and then comes down. The word onset means when effects first begin. The peak is when they feel strongest. The duration is how long the whole thing lasts.
The times below come from controlled studies where trained staff gave a known dose by mouth. Real timing varies from person to person. Eating the dose on a full or empty stomach can shift the start time too.
| Stage. | Time after taking it. | What tends to happen. |
|---|---|---|
| Onset. | About 20 to 40 minutes. | First shifts in mood, body feel, or vision. |
| Coming up. | About 40 to 90 minutes. | Effects grow stronger and steadier. |
| Peak. | About 90 minutes to 3 hours. | Strongest effects on mind and senses. |
| Coming down. | About 3 to 5 hours. | Effects slowly ease. |
| End. | About 4 to 6 hours total. | Most effects fade; some tiredness may stay. |
Most experiences run about four to six hours from start to finish.[1] A very large dose can last longer. Knowing this timeline matters for anyone acting as support. See our trip-sitting page for how to help across these stages.
Common physical effects
Psilocybin affects the body as well as the mind. Most physical effects are mild and pass as the drug wears off. Reported effects include changes in heart rate and blood pressure, wider pupils, and feeling either warm or cold.[2]
Other common body effects include:
- Nausea or an upset stomach, most often early on.
- Yawning, watery eyes, or a runny nose.
- Shaky hands or mild muscle twitches.
- Loss of steady balance and coordination.
- Feeling very tired or, at other times, restless.
Nausea is one of the most common early complaints. In studies, serious physical harm from psilocybin alone is uncommon in healthy, screened adults.[2] Still, some people should avoid it for heart or other health reasons, which we explain on the risks page. Mixing it with other drugs raises the danger — see drug interactions.
Common mental effects
The mental effects are what most people mean by a "trip." They can range from gentle to intense. Common ones include changes in sight, such as brighter colors, moving patterns, or halos around objects.[2] Some people notice sounds seem richer. A sense that time moves faster or slower is also common.
Mood can shift quickly. A person may feel joy, awe, or deep calm one moment and fear or sadness the next. Thoughts may feel looser and more connected. Some people report a sense of unity or a feeling that the self has faded, which researchers call ego dissolution.[3]
Not every experience is pleasant. Fear, confusion, and panic can happen, especially at higher doses or in a stressful place. Researchers pool many study reports to measure how often this happens.[3] A hard experience does not mean lasting damage, but it needs care in the moment. Our difficult experiences page explains how to help someone through it.
How dose changes the experience
Effects depend heavily on dose. This is called dose-dependency. In plain words, more of the drug usually means stronger and longer effects. Pooled study data show that as the dose goes up, changes in perception and emotion rise too, and the chance of anxiety rises as well.[3]
Researchers have described this pattern directly. In one careful study, higher doses led to more intense experiences and a greater chance of strong fear during the session.[4] This is a factual finding from published research. It is not a suggestion to use any amount.
Dose is very hard to judge outside a lab. The amount of psilocybin in a mushroom varies widely, even within one batch, as noted on our what is psilocybin page. That makes any real-world dose uncertain. Because of this, some people feel far more or far less than they expected.
After-effects
The main effects fade in about six hours, but the mind and body may take longer to settle. In the hours after, some people feel drained, foggy, or emotionally raw. Others feel calm or thoughtful. Sleep that night can be lighter than usual.
Over the next day or two, many people report a lingering shift in mood. In some studies, people describe lasting positive feelings weeks later.[4] Others may feel low or unsettled for a short time. These after-effects vary a lot between people.
A small number of people notice brief visual changes after the drug wears off, such as faint trails or grain in their vision. When these last a long time and cause distress, it may be a condition called HPPD. Learn more on our HPPD page. If after-effects feel severe or frightening, treat it as an emergency and see the emergencies page.
Factors that change intensity
Two people can take the same amount and have very different experiences. Many things shape how strong an experience feels. Researchers group the main ones into the person, the setting, and the substance.
| Factor. | Why it matters. |
|---|---|
| Dose. | Higher amounts tend to bring stronger, longer effects. |
| Mindset ("set"). | Mood, expectations, and fears going in shape the experience. |
| Setting. | A calm, safe place tends to feel very different from a chaotic one. |
| Body and health. | Weight, health, and personal chemistry all play a part. |
| Other drugs. | Mixing with other substances can change or worsen effects. |
| Experience level. | Being new or unprepared can make effects feel more intense. |
Mindset and setting are so important that researchers gave them a name: "set and setting."[2] A worried person in a loud, strange place is more likely to have a hard time. Our set and setting page covers this in depth. For clear definitions of any terms used here, see the glossary.
Need help right now?
- Medical emergency (US): call 911.
- Poison Control (US): 1-800-222-1222 — free, confidential, 24/7.
- Fireside Project (psychedelic peer support line, US): call or text 62-FIRESIDE (623-473-7433).
- 988 Suicide & Crisis Lifeline (US): call or text 988.
References
- Nichols DE. Psychedelics. Pharmacological Reviews. 2016;68(2):264-355.
- Johnson MW, Richards WA, Griffiths RR. Human hallucinogen research: guidelines for safety. Journal of Psychopharmacology. 2008;22(6):603-620.
- Studerus E, Kometer M, Hasler F, Vollenweider FX. Acute, subacute and long-term subjective effects of psilocybin in healthy humans: a pooled analysis of experimental studies. Journal of Psychopharmacology. 2011;25(11):1434-1452.
- Griffiths RR, Richards WA, McCann U, Jesse R. Psilocybin can occasion mystical-type experiences having substantial and sustained personal meaning and spiritual significance. Psychopharmacology. 2006;187(3):268-283.