Potential therapeutic effects of psychedelics in small doses: Is there a role for microdosing in psychiatry?
International review of neurobiology – January 01, 2025
Source: PubMed
Summary
Remarkably, very small doses of psychedelics like lysergic acid diethylamide (LSD) and psilocybin show promise in psychiatry. Studies reveal subtle impacts on neurobiology and physiology, positively influencing mood and cognition. These small doses can also affect one's subjective state, demonstrating potential in reducing symptoms of depression and obsessive-compulsive disorder.
Abstract
Clinical trials using full doses of psychedelics have provided preliminary evidence supporting their safety and efficacy in treating a variety of physical and psychological conditions. Anecdotal reports indicate that even very small amounts of these substances may provide therapeutic benefits, though robust clinical studies are still needed. This chapter reviews the current experimental studies in humans using psychedelics in small doses to better understand their therapeutic potential. Research in both neurotypical individuals (n = 18 studies) and patients (n = 3) suggests that small doses of LSD and psilocybin produce subtle, acute, effects on neural connectivity, brain electrophysiology, blood pressure, sleep duration, pain perception, temporal processing, and mood; and show reductions in symptoms of depression and obsessive-compulsive behavior in patient samples. The chapter also discusses the influence of extra-pharmacological factors, such as the baseline subjective state, expectations, and individual differences in drug metabolism, on treatment outcomes. Overall, controlled microdosing studies suggest the potential therapeutic applications of small psychedelic doses, warranting further exploration through large-scale trials in clinical populations.