How long does DMT last? What controlled studies measured, minute by minute

THE SHORT VERSION · SWIPE

▶ Watch it as a 20-second video

‹›

DMT is known for being short, and it is one of the few psychedelics whose time course has been measured minute by minute in labs, with blood samples taken alongside ratings of how strong the effects felt. This guide sets out what those studies found: when effects start, peak and fade, how fast the body clears DMT, why ayahuasca lasts so much longer, and what is known about after-effects. For the basics of the molecule, see what is DMT.

How long does DMT last?

In lab studies, minutes: effects start almost at once, peak within about 2 to 3 minutes and are gone within roughly 15 to 30 minutes when DMT is injected into a vein. The classic finding comes from Rick Strassman’s 1994 studies. Effects “began almost immediately”, peaked at 90 to 120 seconds and were almost completely resolved by 30 minutes (Strassman et al., 1994). In the companion paper, peak blood levels and effects came within 2 minutes and were negligible at 30 (Strassman and Qualls, 1994). Evidence: established.

Newer studies agree. In a London study of 13 volunteers, rated intensity peaked 2 to 3 minutes after the injection and stayed significantly above placebo for 17 minutes (Timmermann et al., 2019). In a 2026 Swiss study, single injections peaked within 2 minutes and “completely subsided within 12–30 min”, with higher amounts lasting longer (Erne et al., 2026). Evidence: established for intravenous DMT in healthy volunteers.

Inhaled (vaporized) DMT has been tested in clinical trials in Brazil. The first phase I trial describes inhaled DMT effects as lasting “around 10 min” (Falchi-Carvalho et al., 2024), and a later trial by the same group gives a short duration of action of 10 to 20 minutes (Falchi-Carvalho et al., 2025). Evidence: preliminary, from a small number of trials by one research group.

Ayahuasca, a drink that contains DMT along with other plant compounds, is a different case. In a placebo-controlled study of 18 volunteers, subjective effects peaked between 1.5 and 2 hours (Riba et al., 2003), and a 2024 review describes effects lasting 4 to 6 hours (Egger et al., 2024). Evidence: established. The reason is explained below, and ayahuasca vs DMT compares the two in full. For mushrooms, see how long magic mushrooms last.

What did the controlled studies measure?

The table lists the human studies we read, with the route, the design, the number of participants and the time course they reported. Amounts given are deliberately left out. “Infusion” means a slow, continuous drip into a vein, which researchers use to hold effects steady for longer.

Read the table with its limits in mind. Every study is small, most enrolled healthy volunteers who had used psychedelics before, and the settings were quiet clinical rooms with medical staff. Several were single-blind or open-label, which matters because a person who knows they received DMT may rate it differently. The 2026 Swiss study found exactly that: some ratings, such as fear, tended to be higher in the blinded arm than in the open-label arm (Erne et al., 2026).

Why is DMT so short-acting?

Because the body breaks it down very quickly. A 2025 systematic review of every human pharmacokinetic study it could find (13 publications, 8 datasets) reported that DMT “is eliminated rapidly, with a half-life of 4.8–19.0 min”. It attributes this mainly to fast metabolism by the enzyme monoamine oxidase A (MAO-A), which turns DMT into indole-3-acetic acid (IAA) (van der Heijden et al., 2025, review). A half-life is the time it takes for the amount in the blood to halve. Evidence: established.

The more detailed studies see two phases. After a 90-minute infusion, DMT fell with an early half-life of about 5 to 6 minutes, then a slower late half-life of about 14 to 16 minutes; effects declined in step with the fast phase (Vogt et al., 2023). After a 120-minute infusion the figures were about 6 to 7 minutes and 18 to 19 minutes (Erne et al., 2025). Evidence: established.

A trial that did not split the phases reported a mean of 9 to 12 minutes, and lab tests in the same paper showed that blocking MAO-A slowed DMT’s breakdown (Good et al., 2023). Evidence: established that DMT is cleared within minutes; the exact figures vary by study design.

Two more findings help explain the short window. During longer infusions, blood levels kept rising while effects levelled off, which researchers read as quick acute tolerance (Vogt et al., 2023; Luan et al., 2023). And the review notes that people differ a lot, possibly because MAO-A activity varies between people, though that has not been measured directly in most studies (van der Heijden et al., 2025, review). Evidence: preliminary for what drives individual differences.

Why does ayahuasca last hours when DMT lasts minutes?

Because of one enzyme. In a 2015 study of six people, DMT given by mouth produced no psychoactive effects and no DMT in the urine: 97% of what was recovered was the MAO-A breakdown product IAA (Riba et al., 2015). A 2024 review describes DMT taken by mouth on its own as “nearly inactive” (Egger et al., 2024). Evidence: established.

Ayahuasca also contains beta-carbolines, compounds that block MAO-A. The 2003 placebo-controlled study concluded that this blocking, mainly in the gut and liver, “would suffice to prevent first-pass metabolism of DMT”, meaning the breakdown that normally happens before a swallowed drug reaches the bloodstream (Riba et al., 2003). DMT then reaches the blood slowly, peaking at 1.5 hours, in step with the peak of effects. Evidence: established for the mechanism.

How long does DMT stay in your system?

In blood, not long. In the studies reviewed in 2025, blood was sampled for up to 4 hours, and in the infusion data DMT fell below the lab’s limit of measurement after about 120 minutes (van der Heijden et al., 2025, review). After a 90-minute infusion, levels dropped “very rapidly” within 15 to 20 minutes of stopping (Vogt et al., 2023). Evidence: established.

Very little leaves the body unchanged. In the one older urine study the review found (seven people, intramuscular injection), only about 0.069% of DMT was recovered unchanged in urine (van der Heijden et al., 2025, review). In the 2015 study, after inhalation, unchanged DMT made up 10% of the compounds recovered in 24-hour urine, with the rest as breakdown products (Riba et al., 2015). Evidence: preliminary, from very few small studies.

We found no verified source giving a standard detection window for DMT in routine drug tests, so we do not give one. For the mushroom version of this question, see how long shrooms stay in your system.

What after-effects were reported, and how soon were people back to baseline?

For the body, the studies report a quick return. After single injections, blood pressure and heart rate rose sharply and peaked within 2 minutes; after infusions, vital signs normalized within 15 minutes of stopping (Vogt et al., 2023). After a 6-hour infusion, raised blood pressure returned to baseline within an hour of stopping (van der Heijden et al., 2025, infusion). Strassman’s 1994 study also recorded rises in blood pressure, heart rate, pupil size, body temperature and several stress hormones (Strassman and Qualls, 1994). Evidence: established.

For the mind, most studies stopped measuring within an hour or so, and none we read tested next-day thinking or driving. The adverse effects they did record include:

• Frequent complaints: headache, tiredness, impaired concentration, weakness, hot flashes and palpitations during long infusions (Erne et al., 2025).
• Anxiety at onset. Single injections produced more negative effects and anxiety than slow infusions (Vogt et al., 2023). One participant in the extended-infusion study had anxiety with chest discomfort that eased within 10 minutes of stopping; follow-up heart tests were normal (Luan et al., 2023).
• Rare lasting problems. One participant had anxiety and panic attacks the day after a 6-hour infusion and was offered counselling (van der Heijden et al., 2025, infusion). In another study, a participant’s panic attacks began shortly after the session, eased within 2 months and returned 3 months later (Erne et al., 2026). One person left a study after pre-existing tinnitus got worse (Erne et al., 2025).
• For ayahuasca, survey data summarized in a 2024 review found challenging experiences were common and adverse psychological reactions typically subsided within a few days, though 12% of those affected sought further professional help (Egger et al., 2024).

Some trials are now testing whether a short DMT session has effects that outlast it. In one small open-label trial in Brazil (14 people with treatment-resistant depression, no control group), depression scores were lower a week later (Falchi-Carvalho et al., 2025). Without a control group that cannot show the drug caused the change. Evidence: preliminary.

What is DMT’s legal status in Canada?

DMT (N,N-dimethyltryptamine) is item 7 of Schedule III of the Controlled Drugs and Substances Act. We read the Justice Laws consolidation current to 30 September 2026 (Justice Laws, CDSA). Check the official page for any later change. This is general information, not legal advice; see is DMT legal in Canada. We found no DMT trial with a Canadian site on ClinicalTrials.gov when we searched on 20 October 2026 (ClinicalTrials.gov); the studies above were run in countries including the United States, the United Kingdom, Switzerland, the Netherlands and Brazil.

What we still don’t know

• How long effects last outside a clinic. Every timing here comes from supervised studies, most of them using injection or infusion (unresolved).
• How much people differ, and why. MAO-A activity is a likely factor, but the studies have not measured it directly in most participants (preliminary).
• Next-day effects on attention, sleep, mood or driving. We found no study that tested them (unresolved).
• How rare lasting psychological problems are. The cases above are single reports from small trials, so no rate can be given (unresolved).
• Inhaled DMT’s exact time course. The published inhaled trials come from one research group and give approximate durations (preliminary).

The short version: in controlled studies, DMT acts in minutes and is cleared in minutes, while ayahuasca lasts hours because it blocks the enzyme that clears DMT. Check the date on this page, because DMT research is moving quickly. For background, read what are magic mushrooms or our comparison of psilocybin, LSD and DMT.

Shroomverse sells mushroom products. This article is general information about clinical research on DMT. It is not medical, legal or purchasing advice, and it does not recommend any product or substance.