end of lifeFull doseFullStrong evidence

Fifty-one cancer patients, and six months of relief

The trial that made the modern research revival credible.

2016Published
Randomised double-blind crossover trialStudy type
51 peopleSample
What our evidence ratings mean

What they did

Johns Hopkins gave adults facing life-threatening cancer one high dose of psilocybin and one very low comparison dose in random order, five weeks apart, with supportive monitoring throughout.

What they found

The high dose produced large drops in both clinician-rated and self-rated depression and anxiety. About 80 percent of participants still showed clinically significant improvement at the six month follow-up.

80%still improved at 6 months
51participants

Worth knowing

A very low dose is not an inert placebo, and participants could tell the difference between the two sessions. The population is specific, people confronting mortality, and the results may not transfer to general anxiety.

Griffiths et al. Psilocybin produces substantial and sustained decreases in depression and anxiety in patients with life-threatening cancer. Journal of Psychopharmacology, 2016.

Read the source

The durability findings here are the ones most often quoted out of context. Read the follow-up periods before you trust a headline about them.

For education, not medical advice. Every write-up links back to the original source.
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