Frontier mental health research: psychedelics & drug studies

Each month our editorial team sifts through hundreds of papers and curates notable findings—for practitioners and informed readers who want to stay current with the evidence. Subscribe to the monthly Research Digest for expert analysis and concise summaries of key papers.

8 papers

Anxiety

Based on 52 papers

Research points to two clear groups of treatments for anxiety. First, ordinary approaches like exercise — especially walking and other regular physical activity — have strong, high-quality evidence showing medium-sized reductions in anxiety symptoms. These are proven in many randomized trials and reviews. Second, newer substance-assisted therapies (often called psychedelic‑assisted therapy) are promising. Small clinical trials and reviews show reductions in anxiety and related problems after carefully supervised doses of drugs such as psilocybin, MDMA, ketamine, and ayahuasca. However, these drug approaches are mostly early-stage or done in special research settings and need more, larger trials before they can become routine care. People thinking about or treating anxiety should know that drug‑assisted therapies are almost always given together with serious psychological support. How the drug is given, the preparation before it, and follow-up therapy matter a lot. There are also safety and equity issues to watch: some psychedelics can have rare lasting side effects, many studies are small, and people of color have been underrepresented in trials. For now, exercise has the clearest and broadest evidence. Other treatments are promising but still need more testing and careful medical oversight.

Key findings

  • Many high-quality reviews find regular physical activity reduces anxiety by a medium amount across many trials. 8792
  • Walking specifically lowers anxiety symptoms compared with doing nothing, based on 26 randomized trials pooled together. 8785
  • Clinical trials and reviews report that psychedelic-assisted therapies (drugs given with therapy) reduced anxiety symptoms in people diagnosed with anxiety disorders. 15068 15063 15056
  • For post‑traumatic stress disorder (a trauma-related anxiety condition), MDMA given with psychotherapy produced large benefits in several controlled trials. 15063
  • Psychedelic drugs appear to change the brain in ways that could help anxiety and mood problems. Lab and imaging studies report increased brain plasticity (the brain’s ability to form new connections) and changes in inflammation and brain networks after substances like psilocybin, DMT, and other psychedelics. 15132 15050 15091 15135
  • Ketamine produces fast antidepressant effects and has been tested as an alternative to electroconvulsive therapy; it has also been studied for anxiety-related conditions in some trials. 10149 10160 15068
  • Most studies of psilocybin and other classic psychedelics are small and done with close medical and psychological support, so experts say larger, well‑controlled trials are still needed before routine use. 15056 15078
  • How people are prepared and supported matters a lot: many guides and reviews agree that screening, setting expectations, building trust, and follow‑up therapy are core parts of substance‑assisted psychotherapy. 15065 15092 15063
  • People of color were underrepresented in many psychedelic-assisted psychotherapy studies, which limits how well the results apply to different ethnic groups. 15095
  • There are risks to be aware of: rare but long-lasting perceptual problems (called HPPD) and other psychological or physical side effects have been reported after hallucinogen use, so safety monitoring is important. 15048 15087

Adult ADHD and comorbid disorders: clinical implications of a dimensional approach

Martin A. Katzman, Timothy S. Bilkey, Pratap Chokka, Angelo Fallu, Larry J. Klassen
BMC Psychiatry Summary & key facts 2017 648 citations

This review says adult ADHD affects about 2.5% of adults and often occurs with other mental health problems. Adults with ADHD commonly have trouble with attention, memory, planning, self-control, and emotions. The condition is often missed or undertreated, is linked with big personal and social problems, and the evidence on…

Attention Deficit Hyperactivity Disorder Functional Brain Connectivity Studies Neural and Behavioral Psychology Studies

The prevalence and burden of subthreshold generalized anxiety disorder: a systematic review

Heidemarie Haller, Holger Cramer, Romy Lauche, Florian Gaß, Gustav Dobos
BMC Psychiatry Summary & key facts 2014 270 citations

The article describes “high functioning anxiety” as a way some people with anxiety symptoms talk about their experience, not as an official medical diagnosis. It says people can look successful and cope outwardly while having common anxiety symptoms, and that diagnosis can be hard because the symptom effects may be…

Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes Child and Adolescent Psychosocial and Emotional Development Maternal Mental Health During Pregnancy and Postpartum

Inclusion of people of color in psychedelic-assisted psychotherapy: a review of the literature

Timothy I. Michaels, Jennifer Purdon, Alexis Collins, Monnica T. Williams
BMC Psychiatry Summary & key facts 2018 247 citations

The authors reviewed psychedelic-assisted psychotherapy studies published from 1993 to 2017 to see how many people of color took part. They found 18 studies with about 280 people. About 82% of participants were non-Hispanic White, while only small percentages were African American, Latino, Asian, indigenous, or mixed race. Because so…

Natural Compound Pharmacology Studies Neurotransmitter Receptor Influence on Behavior Psychedelics and Drug Studies Ayahuasca LSD

Medicinal cannabis for psychiatric disorders: a clinically-focused systematic review

Jerome Sarris, Justin Sinclair, Diana Karamacoska, Margaret Davidson, Joseph Firth
BMC Psychiatry Summary & key facts 2020 243 citations

This 2019 systematic review looked at human studies of medicinal cannabis and cannabis-derived isolates for major psychiatric disorders. The authors found that the evidence is very new and limited, so it is too early to recommend cannabis medicines for psychiatric conditions. Some small or isolated studies suggest benefits for a…

Cannabis and Cannabinoid Research Infant Health and Development Sleep and Wakefulness Research

Psychiatric disorders risk in patients with iron deficiency anemia and association with iron supplementation medications: a nationwide database analysis

Herng‐Sheng Lee, Hsin-Hao Chao, Wan‐Ting Huang, Solomon Chih‐Cheng Chen, Hsin‐Yi Yang
BMC Psychiatry Summary & key facts 2020 89 citations

This population study used Taiwan's national health insurance records to compare adults with iron deficiency anemia (IDA) to matched people without IDA from 2000–2013. After adjusting for other factors, people with IDA had a higher risk of being diagnosed with psychiatric disorders (adjusted hazard ratio 1.52, 95% CI 1.45–1.59). The…

Erythropoietin and Anemia Treatment Hemoglobinopathies and Related Disorders Iron Metabolism and Disorders

Effects of ∆9-tetrahydrocannabinol on aversive memories and anxiety: a review from human studies

Ana Maria Raymundi, Thiago Rodrigues da Silva, Jeferson Machado Batista Sohn, Leandro J. Bertoglio, Cristina Aparecida Jark Stern
BMC Psychiatry Summary & key facts 2020 42 citations

This review looked at human studies up to July 2020 about THC (the main psychoactive part of Cannabis) and its effects on fear-related memories and anxiety. The authors report that low doses of THC can speed up extinction of aversive memories and lower anxiety in people, and that combining THC…

Cannabis and Cannabinoid Research Memory and Neural Mechanisms Neuroscience and Neuropharmacology Research

RETRACTED ARTICLE: ArticleNoteRapid and sustained antidepressant effects of intravenous ketamine in treatment-resistant major depressive disorder and suicidal ideation: a randomized clinical trial

Ahmad Zolghadriha, Afagh Anjomshoaa, Mohammad Jamshidi, Farnaz Taherkhani
BMC Psychiatry Summary & key facts 2024 20 citations

This paper reported a small, randomized trial of 64 people with treatment-resistant major depression who were given a single intravenous dose of ketamine or a saline placebo. The authors said depression and suicidal thoughts dropped quickly — within an hour — and that benefits lasted up to two months, but…

Mental Health Research Topics Treatment of Major Depression Tryptophan and brain disorders Ketamine

Antidepressant-associated sexual dysfunction in outpatients

Yasir Şafak, Sena Inal Azizoglu, Furkan Bahadır Alptekin, Tacettin Kuru, Mehmet Emrah Karadere, Şule Kaya, et al.
BMC Psychiatry Summary & key facts 2025 13 citations

This study asked 452 outpatients in Türkiye who had used one antidepressant for at least one month about sexual problems. Using a standard questionnaire, researchers found very high rates of self-reported sexual dysfunction: 88.7% of women and 84.5% of men. Women taking bupropion reported lower levels of sexual dysfunction than…

Hormonal and reproductive studies Sexual function and dysfunction studies Urinary Bladder and Prostate Research
Summaries and links are for general information and education only. They are not a substitute for reading the original publication or for professional medical, legal, or other advice. Always refer to the linked source for the full study.