Griffiths, R.R., Johnson, M.W., Carducci, M.A., Umbricht, A., Richards, W.A., Richards, B.D., . . . Klinedinst, M.A. (2016). Psilocybin produces substantial and sustained decreases in depression and anxiety in patients with life-threatening cancer: A randomized double-blind trial. Journal of Psychopharmacology, 30, 1181–1197.
To examine the effect of two psilocybin doses on symptoms of anxiety and depression among patients with advanced cancer
Participants were assigned to two groups: one received low-dose psyilocybin in the first session and high-dose psyilocybin in a second session. The other group received psilocybin doses in reverse order. The first session was done about one month after study entry, and the second session was five weeks later. Study measures were obtained at baseline, during, and at the end of each session, and approximately six months later. Session monitors met with patients prior to sessions to establish rapport and prepare the patient for the sessions. Drug session were done in a living room-like environment with two monitors present.
Crossover, double blind, randomized study
There were no serious adverse effects of the intervention. There were transient moderate increases in blood pressure after psilocybin. Transient psychological distress was seen in some patients with high-dose psilocybin. All measures of depression, anxiety, and total mood disturbance showed significant improvement with high dose (p < 0.001). Death acceptance and optimism also were increased with high-dose intervention (p < 0.01). These changes were maintained at 6 months.
High-dose psilocybin under supportive conditions was shown to decrease symptoms of depression and anxiety, and improve mood, optimism, acceptance of death and spirituality. These effects were generally maintained for months after drug use.
Administration of psilocybin under controlled supportive conditions was shown to have multiple benefits for patients with terminal cancers. Further confirmatory research is warranted, and research comparing outcomes with psilocybin to other appropriate interventions would be helpful.