• Daniel Rosenbaum, Cory Weissman, Thomas Anderson, Rotem Petranker, Le-Anh Dinh-Williams, Katrina Hui, and Emma Hapke.
• Psychiatry, University of Toronto Faculty of Medicine, Toronto, Canada.
• J. Psychopharmacol. (Oxford). 2020 Jun 1; 34 (6): 612-622.

RationaleMicrodosing psychedelics - the practice of consuming small, sub-hallucinogenic doses of substances such as LSD or psilocybin - is gaining attention in popular media but remains poorly characterized. Contemporary studies of psychedelic microdosing have yet to report the basic psychiatric descriptors of psychedelic microdosers.ObjectivesTo examine the practices and demographics of a population of psychedelic microdosers - including their psychiatric diagnoses, prescription medications, and recreational substance use patterns - to develop a foundation on which to conduct future clinical research.MethodsParticipants (n = 909; Mage = 26.9, SD = 8.6; male = 83.2%; White/European = 79.1%) recruited primarily from the online forum Reddit completed an anonymous online survey. Respondents who reported using LSD, psilocybin, or both for microdosing were grouped and compared with non-microdosing respondents using exploratory odds ratio testing on demographic variables, rates of psychiatric diagnoses, and past-year recreational substance use.ResultsOf microdosers, most reported using LSD (59.3%; Mdose = 13 mcg, or 11.3% of one tab) or psilocybin (25.9%; Mdose = 0.3 g of dried psilocybin mushrooms) on a one-day-on, two-days-off schedule. Compared with non-microdosers, microdosers were significantly less likely to report a history of substance use disorders (SUDs; OR = 0.17 (95% CI: 0.05-0.56)) or anxiety disorders (OR = 0.61 (95% CI: 0.41-0.91)). Microdosers were also more likely to report recent recreational substance use compared with non-microdosers (OR = 5.2 (95% CI: 2.7-10.8)).ConclusionsWell-designed randomized controlled trials are needed to evaluate the safety and tolerability of this practice in clinical populations and to test claims about potential benefits.

24 keywords...

hide…