Psilocybin Relieves Major Depression, Study Shows

In a small study of adults with major depression, Johns Hopkins Medicine researchers report that two doses of the psychedelic substance psilocybin, given with supportive psychotherapy, produced rapid and large reductions in depressive symptoms, with most participants showing improvement and half of study participants achieving remission through the four-week follow-up.

A compound found in so-called magic mushrooms, psilocybin produces visual and auditory hallucinations and profound changes in consciousness over a few hours after ingestion. In 2016, Johns Hopkins Medicine researchers first reported that treatment with psilocybin under psychologically supported conditions significantly relieved existential anxiety and depression in people with a life-threatening cancer diagnosis.

Now, the findings from the new study, published Nov. 4 in JAMA Psychiatry, suggest that psilocybin may be effective in the much wider population of patients who suffer from major depression than previously appreciated.

"The magnitude of the effect we saw was about four times larger than what clinical trials have shown for traditional antidepressants on the market," says Alan Davis, Ph.D., adjunct assistant professor of psychiatry and behavioral sciences at the Johns Hopkins University School of Medicine. "Because most other depression treatments take weeks or months to work and may have undesirable effects, this could be a game changer if these findings hold up in future 'gold-standard' placebo-controlled clinical trials." The published findings cover only a four-week follow-up in 24 participants, all of whom underwent two five-hour psilocybin sessions under the direction of the researchers.

"Because there are several types of major depressive disorders that may result in variation in how people respond to treatment, I was surprised that most of our study participants found the psilocybin treatment to be effective," says Roland Griffiths, Ph.D., the Oliver Lee McCabe III Professor in the Neuropsychopharmacology of Consciousness at the Johns Hopkins University School of Medicine and director of the Johns Hopkins Center for Psychedelic and Consciousness Research. He says the major depression treated in the new study may have been different than the "reactive" form of depression in patients they studied in the 2016 cancer trial. Griffiths says his team was encouraged by public health officials to explore psilocybin's effects in the broader population of those with major depressive disorder because of the much larger potential public health impact.

by Johns Hopkins University School of Medicine, MedicalXPress | Read more:
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