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.
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.
Psychedelics in the treatment of unipolar mood disorders: a systematic review
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.
View paperEfficacy, tolerability, and safety of serotonergic psychedelics for the management of mood, anxiety, and substance-use disorders: a systematic review of systematic reviews
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.
View paperPost-Psychedelic Reductions in Experiential Avoidance Are Associated With Decreases in Depression Severity and Suicidal Ideation
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.
View paperPsychological flexibility mediates the relations between acute psychedelic effects and subjective decreases in depression and anxiety
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.
View paperEffects of Psilocybin-Assisted Therapy on Major Depressive Disorder
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.
View paperQuality of acute psychedelic experience predicts therapeutic efficacy of psilocybin for treatment-resistant depression
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.
View paperPsilocybin with psychological support for treatment-resistant depression: six-month follow-up
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.
View paperPsilocybin for treatment-resistant depression: fMRI-measured brain mechanisms
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.
View paperTherapeutic mechanisms of psilocybin: Changes in amygdala and prefrontal functional connectivity during emotional processing after psilocybin for treatment-resistant depression
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.
View paperRapid antidepressant effects of the psychedelic ayahuasca in treatment-resistant depression: a randomized placebo-controlled trial
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.
View paperHow 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.