Top 10

Top 10 Psychedelics in the Treatment of Depression Papers

A Top 10 reading list on psychedelics for depression, covering LSD history, psilocybin trials, ayahuasca, brain imaging, and mechanisms.

Published March 2, 2026

This post was made by Floris Wolswijk in cooperation, and co-published↗, with the MIND Foundation

Depression is a mental disorder characterised by mood disturbances, persistent inability to feel pleasure, and suicidal tendencies. Roughly 264 million people worldwide were affected by depression in 2017. Studies suggest that up to 20% of the members of American society will experience depressive episodes during their lifetime. Anxiety disorders occur parallel to clinical depression in about 50% of the cases.

Mainstream antidepressants have played an important role in alleviating the symptoms in patients suffering from depression. However, their effects are often delayed, unwanted side effects are common, and some patients do not respond to the treatment at all. The socioeconomic costs of depression are high, and many patients relapse after the treatment terminates.

Psychedelics offer a new avenue in the treatment of depression. The studies that we have highlighted show an unmatched potential by any of the current alternatives. Yet, at the same time, we have to remain careful not to declare an early victory.

Although promising, the research presented in this Top 10 has mostly been done with small sample sizes, within carefully designed settings, and therapists with many years of experience. The therapeutic alliance – the relationship between the patient and therapist – and placebo effects are definitely at play. Moreover, psychedelics can’t directly impact the underlying (family, societal, economic) causes of depression.

Considering the above, the following ten publications will summarise the essential studies investigating the potential of psychedelics in the treatment of depression.

1

Psychedelics in the treatment of unipolar mood disorders: a systematic review

Journal of Psychopharmacology/2016/Rucker, J., Young, A. H., Jelen, L. A. et al.
metaopenCited 186×

Rucker and colleagues recover the pre-prohibition literature on psychedelics for unipolar mood disorders. The review is important because it shows both the early therapeutic signal and the limits of older study designs, giving modern depression research a historical baseline.

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2

Efficacy, tolerability, and safety of serotonergic psychedelics for the management of mood, anxiety, and substance-use disorders: a systematic review of systematic reviews

Expert Review of Clinical Pharmacology/2018/Dos Santos, R. G., Bouso, J. C., Hallak, J. E.
metapaywallCited 230×

This review of systematic reviews summarises the early modern evidence for serotonergic psychedelics across mood, anxiety, and substance-use disorders. It is useful because it highlights promise while clearly showing why larger and longer studies were still needed.

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3

Post-Psychedelic Reductions in Experiential Avoidance Are Associated With Decreases in Depression Severity and Suicidal Ideation

Frontiers in Psychiatry/2020/Zeifman, R. J., Wagner, A. C., Watts, R. et al.
individualopenCited 102×

Zeifman and colleagues examine experiential avoidance as a possible pathway from psychedelic use to lower depression severity and suicidal ideation. The paper is interesting because it connects symptom change to a psychological process that therapy can directly target.

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4

Psychological flexibility mediates the relations between acute psychedelic effects and subjective decreases in depression and anxiety

Journal of Contextual Behavioral Science/2020/Davis, A. K., Barrett, F. S., Griffiths, R. R.
individualopenCited 367×

Davis, Barrett, and Griffiths test psychological flexibility as a bridge between acute psychedelic effects and later decreases in depression and anxiety. The study matters because it turns broad claims about insight into a measurable therapeutic mechanism.

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5

Effects of Psilocybin-Assisted Therapy on Major Depressive Disorder

JAMA Psychiatry/2021/Davis, A. K., Barrett, F. S., May, D. G. et al.
individualopenCited 1,236×

This Johns Hopkins trial helped move psilocybin for major depression into mainstream clinical discussion. Even with an open-label design and small sample, it showed rapid, substantial symptom reductions after two supported psilocybin sessions and motivated larger trials.

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6

Quality of acute psychedelic experience predicts therapeutic efficacy of psilocybin for treatment-resistant depression

Frontiers in Pharmacology/2018/Roseman, L., Nutt, D. J., Carhart-Harris, R. L.
individualopenCited 805×

Roseman and colleagues ask what kind of acute experience predicts improvement after psilocybin for treatment-resistant depression. The finding that oceanic boundlessness, rather than visual intensity, tracked outcomes sharpened the field's focus on psychological quality over spectacle.

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7

Psilocybin with psychological support for treatment-resistant depression: six-month follow-up

Psychopharmacology/2017/Carhart-Harris, R. L., Bolstridge, &. M., Day, C. M. J. et al.
individualopenCited 965×

This six-month follow-up extended the early psilocybin depression work beyond immediate response. It is useful because it showed that some benefits persisted, while also underlining the need for controlled studies and careful psychological support around dosing.

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8

Psilocybin for treatment-resistant depression: fMRI-measured brain mechanisms

Scientific Reports/2017/Carhart-Harris, R. L., Roseman, L., Bolstridge, M. et al.
individualopenCited 585×

This brain-imaging paper helped frame psilocybin therapy as a possible reset of depressive brain dynamics. It is interesting because post-treatment connectivity changes, rather than only acute drug effects, were linked to later clinical response.

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9

Therapeutic mechanisms of psilocybin: Changes in amygdala and prefrontal functional connectivity during emotional processing after psilocybin for treatment-resistant depression

Journal of Psychopharmacology/2020/Mertens, L. J., Wall, M. B., Roseman, L. et al.
individualopenCited 206×

Mertens and colleagues examine how psilocybin may affect emotional processing in treatment-resistant depression. The paper focuses on amygdala and prefrontal connectivity, supporting the idea that therapy may involve restored emotional responsiveness rather than emotional blunting.

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10

Rapid antidepressant effects of the psychedelic ayahuasca in treatment-resistant depression: a randomized placebo-controlled trial

Psychological Medicine/2018/Palhano-Fontes, F., Barreto, D., Onias, H. et al.
individualopenCited 814×

This controlled ayahuasca trial broadened the depression literature beyond psilocybin and ketamine. It is notable because a single supported ayahuasca session produced rapid antidepressant effects in treatment-resistant depression while adding data on safety and tolerability.

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How we choose these papers

These lists are curated by hand, not generated by an algorithm. We weigh citation counts, study quality, and lasting influence on the field, and we revisit each list as new research lands. Read more about how Blossom decides what to include in our curation explainer.