Systematic review: ayahuasca and suicidal thoughts in hard-to-treat depression

The question

Does ayahuasca, a traditional Amazonian psychedelic brew, reduce suicidal thinking in people with depression that has not responded to standard treatment?

What they did

The authors searched the published literature and screened 6,633 records. Five studies met their inclusion criteria and were reviewed. They summarized the reported effects of ayahuasca on suicidal ideation and depressive symptoms, along with proposed biological explanations.

What they found

Across the five included studies, which differed in methods, ayahuasca was associated with rapid and significant reductions in suicidal ideation and depressive symptoms in people with depressive disorders. The authors attribute the effects to the combined action of two components of the brew, beta-carbolines and DMT. They also describe proposed brain mechanisms, including increased brain-derived neurotrophic factor (a protein linked to brain plasticity) and reduced activity in the default mode network, a set of brain regions active during self-focused thought.

The fine print

Only five studies were included, and the abstract does not report how many people took part in total, what doses were used, or how long participants were followed. The studies differed in design and quality, and no pooled statistical result is given. Claims about brain mechanisms are interpretations, not direct findings about suicide risk. This summary is based on the abstract alone.

What it means

Early clinical evidence suggests ayahuasca may be linked to quick drops in suicidal thinking and depressive symptoms, but the studies so far are few and varied, and the authors themselves call for large, rigorous trials before any clinical use.

Evidence grade: Low. A systematic review that pooled only five studies of differing designs and quality, with no combined statistical analysis or participant total reported in the abstract.

This summary is based on the study’s published abstract.