Cited by 89Psychedelics and Drug StudiesForensic Toxicology and Drug AnalysisAlkaloids: synthesis and pharmacology

Acute effects of intravenous DMT in a randomized placebo-controlled study in healthy participants

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Vogt, Severin B., Ley, Laura, Erne, Livio, Straumann, Isabelle, Becker, Anna M., Klaiber, Aaron, Holze, Friederike, Vandersmissen, Anja +7 more·2023·Translational Psychiatry

Abstract

Abstract N,N-dimethyltryptamine (DMT) is distinct among classic serotonergic psychedelics because of its short-lasting effects when administered intravenously. Despite growing interest in the experimental and therapeutic use of intravenous DMT, data are lacking on its clinical pharmacology. We conducted a double-blind, randomized, placebo-controlled crossover trial in 27 healthy participants to test different intravenous DMT administration regimens: placebo, low infusion (0.6 mg/min), high infusion (1 mg/min), low bolus + low infusion (15 mg + 0.6 mg/min), and high bolus + high infusion (25 mg + 1 mg/min). Study sessions lasted for 5 h and were separated by at least 1 week. Participant’s lifetime use of psychedelics was ≤20 times. Outcome measures included subjective, autonomic, and adverse effects, pharmacokinetics of DMT, and plasma levels of brain-derived neurotropic factor (BDNF) and oxytocin. Low (15 mg) and high (25 mg) DMT bolus doses rapidly induced very intense psychedelic effects that peaked within 2 min. DMT infusions (0.6 or 1 mg/min) without a bolus induced slowly increasing and dose-dependent psychedelic effects that reached plateaus after 30 min. Both bolus doses produced more negative subjective effects and anxiety than infusions. After stopping the infusion, all drug effects rapidly decreased and completely subsided within 15 min, consistent with a short early plasma elimination half-life (t1/2α) of 5.0–5.8 min, followed by longer late elimination (t1/2β = 14–16 min) after 15–20 min. Subjective effects of DMT were stable from 30 to 90 min, despite further increasing plasma concentrations, thus indicating acute tolerance to continuous DMT administration. Intravenous DMT, particularly when administered as an infusion, is a promising tool for the controlled induction of a psychedelic state that can be tailored to the specific needs of patients and therapeutic sessions. Trial registration: ClinicalTrials.gov identifier: NCT04353024

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  • The study excluded participants with more than 15 lifetime psychedelic experiences, resulting in a sample with no or only little previous psychedelic experience.

    “While other studies investigating psychedelics often include participants with previous psychedelic experience (17, 18), we excluded participants more than 15 lifetime psychedelic experiences resulting in a sample with no or only little previous psychedelic experience.”

    From Potential therapeutic effects of an ayahuasca-inspired N,N-DMT and harmine formulation: a controlled trial in healthy subjects (2024) · cites this paper as [18]

    The Methods and Materials > Participants passage gives an exclusion threshold of more than 20 lifetime uses of hallucinogenic substances, not more than 15. It also reports that 24 of 27 participants had previously used a psychedelic, although their reported use of individual psychedelics was limited. (LLM, conf=0.91)

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  • While the intensity of the experience was rather moderate-as expected with the incremental dosing of 10 single doses à 10 mg of DMT-the study set up, including the experimental tasks, might have even attenuated the subjective effects and distracted participants from their inner processes.

    “While the intensity of the experience was rather moderate–as expected with the incremental dosing of 10 single doses à 10 mg of DMT [compare also bolus and total doses of other studies, e.g., (18)]–the study set up, including the experimental tasks, might have even attenuated the subjective effects and distracted participants from their inner processes, as reported in some of the diary texts (ex”

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Research works printed but not linked: 1

  1. [17]Szara S. The comparison of the psychotic effect of tryptamine derivatives with the effects of mescaline and LSD-25 in self-experiments. In: Garattini S, Ghetti V, editors. Psychotropic Drugs. Amsterdam: Elsevier; 1957.

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Authors
Vogt, S. B., Ley, L., Erne, L., Straumann, I., Becker, A. M., Klaiber, A., Holze, F., Vandersmissen, A., Mueller, L., Duthaler, U., Rudin, D., Luethi, D., Varghese, N., Eckert, A., & Liechti, M. E.
Affiliations
University of Basel (CH)
Corresponding author
Liechti, Matthias E.
Venue
Translational Psychiatry
Published
2023-05-23
Volume
13
Issue
1
Pages
172-172
ISSN
2158-3188 (ISSN-L)
OpenAlex
W4377940122
Cited by
89
References
34
Citations by year
2026: 21 · 2025: 32 · 2024: 25 · 2023: 11
FWCI
25.95
Type
journal article
Language
en
Open access
Locations
  • Translational Psychiatry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by-nc-nd)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (32003B_185111, P5R5PM_206796)
Topics
  • Social Sciences › Psychology › Clinical Psychology › Psychedelics and Drug Studies
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Forensic Toxicology and Drug Analysis
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Alkaloids: synthesis and pharmacology
Keywords
N,N-dimethyltryptamine, psychedelic effects, acute tolerance, pharmacokinetics, plasma half-life, brain-derived neurotrophic factor, oxytocin, autonomic effects, adverse effects, anxiety
MeSH terms
Anxiety, N,N-Dimethyltryptamine, Hallucinogens, Humans, Administration, Intravenous, Healthy Volunteers

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