A low dose of lysergic acid diethylamide decreases pain perception in healthy volunteers
Johannes G. Ramaekers, Nadia R. P. W. Hutten, Natasha L. Mason, Patrick C. Dolder, Eef L. Theunissen, Friederike Holze, Matthias E. Liechti, Amanda Feilding, Kim P. C. Kuypers
Journal of Psychopharmacology August 25, 2020 DOI: 10.1177/0269881120940937 via OpenAlex
Summary
AI-generated from the abstractA low dose of LSD (20 micrograms) that does not cause a psychedelic experience can increase pain tolerance and reduce the unpleasantness of pain in healthy volunteers. In a controlled experiment with 24 participants, those given 20 µg of LSD kept their hand in cold (3°C) water longer and reported less pain than when given a placebo. Smaller doses (5 and 10 µg) did not produce the same effect. The 20 µg dose caused slight increases in blood pressure, anxiety, and dissociation, but no profound mind-altering effects. These findings suggest that very low doses of LSD may offer a new approach to pain management without the intense psychological effects of higher doses.
Study at a glance
| Characteristics | Randomized controlled trial Peer reviewed |
|---|---|
| Sample size | 24 |
| Population | Healthy volunteers |
| Topics | Anxiety LSD |
| Keywords | Analgesic Placebo Anesthesia Hallucinogen |
| Citations | 95 |
| Key finding | A 20 µg dose of LSD, low enough to avoid a psychedelic experience, significantly increased pain tolerance and reduced subjective pain and unpleasantness in a cold pressor test. |
Abstract
Background: Lysergic acid diethylamide (LSD) is an ergot alkaloid derivative with psychedelic properties that has been implicated in the management of persistent pain. Clinical studies in the 1960s and 1970s have demonstrated profound analgesic effects of full doses of LSD in terminally ill patients, but this line of research evaporated after LSD was scheduled worldwide. Aim: The present clinical study is the first to revisit the potential of LSD as an analgesic, and at dose levels which are not expected to produce profound mind-altering effects. Methods: Twenty-four healthy volunteers received single doses of 5, 10 and 20 µg LSD as well as placebo on separate occasions. A Cold Pressor Test was administered at 1.5 and 5 h after treatment administration to assess pain tolerance to experimentally evoked pain. Ratings of dissociation and psychiatric symptoms as well as assessments of vital signs were included to monitor mental status as well as safety during treatments. Results: LSD 20 µg significantly increased the time that participants were able to tolerate exposure to cold (3°C) water and decreased their subjective levels of experienced pain and unpleasantness. LSD elevated mean blood pressure within the normal range and slightly increased ratings of dissociation, anxiety and somatization. Conclusion: The present study provides evidence of a protracted analgesic effect of LSD at a dose that is low enough to avoid a psychedelic experience. The present data warrant further research into the analgesic effects of low doses of LSD in patient populations.