Ketamine as a mental health treatment: Are acute psychoactive effects associated with outcomes? A systematic review
Abstract
Esketamine was recently licensed by the US Food and Drug Administration (FDA) and European Drug Agency (EDA) for use in treatment resistant depression (TRD), and further research indicates ketamine as a possible treatment in other mental health conditions. While the underlying mechanisms remain unclear, it has been hypothesised that ketamine's acute psychoactive effects may be associated with psychiatric treatment efficacy. We systematically reviewed the evidence for this association. The databases Medline, Embase and PsychInfo were searched up to June 2019. Studies were included if they enrolled adults with a psychiatric diagnosis, assessed acute psychoactive effects using a quantitative measure, and reported on the relationship between acute effects and treatment outcome. We included 21 studies, involving 891 patients. Seventeen studies assessed patients with depression (TRD [k = 14]), three assessed substance use disorders, and one assessed social anxiety disorder. Overall, 41 associations were assessed, of which 26 % were significant. The studies reviewed displayed great variability in terms of methodology and quality of reporting. The most commonly assessed effect was dissociation, measured by the CADSS. Our results suggest that the CADSS total is not consistently associated with antidepressant outcomes. Apart from this, the current literature is too limited to draw definite conclusions on the presence of an association between acute psychoactive effects and mental health outcomes. The field would benefit from consistently employing a priori hypotheses, more transparent reporting and sufficiently powered statistical analyses. Furthermore, the use of a broader range of assessments tools of acute psychoactive effects during ketamine administration would be beneficial.
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In clinical trials, ketamine's psychedelic effects are usually either not addressed or regarded as unwanted psychotic side adverse effects.
“These psychedelic effects are usually either not addressed (Grabski et al., 2020;Mathai et al., 2020) or regarded as unwanted 'psychotic' side adverse effects in clinical trials (Romeo et al., 2015).”
From Psychedelics for the treatment of depression, anxiety, and existential distress in patients with a terminal illness: a systematic review (2022) · cites this paper as Grabski et al., 2020
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McIntyre, R. S., Rosenblat, J. D., Nemeroff, C. B., Sanacora, G., Murrough, J. W., Berk, M., Brietzke, E., Dodd, S., Gorwood, P., Ho, R., et al. (2021) · American Journal of Psychiatry · doi:10.1176/appi.ajp.2020.20081251 · Cited by 731 · see citing works
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Mollaahmetoglu, O. M., Keeler, J., Ashbullby, K. J., Ketzitzidou-Argyri, E., Grabski, M., & Morgan, C. J. A. (2021) · Frontiers in Psychiatry · doi:10.3389/fpsyt.2021.695335 · Cited by 65 · see citing works
Self-citation
- Authors
- Grabski, M., Borissova, A., Marsh, B., Morgan, C. J. A., & Curran, H. V.
- Affiliations
- University of Exeter (GB)
- University College Hospital (GB)
- University College London (GB)
- Venue
- Behavioural Brain Research
- Publisher
- Elsevier BV
- Published
- 2020-08
- Volume
- 392
- Pages
- 112629
- ISSN
- 0166-4328 (ISSN-L)
- OpenAlex
- W3029786173
- Cited by
- 55
- References
- 13
- Citations by year
- 2026: 11 · 2025: 9 · 2024: 15 · 2023: 6 · 2022: 5 · 2021: 7 · 2020: 2
- FWCI
- 0.66
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Behavioural Brain Research (publishedVersion)
- PubMed (publishedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Funders
- Medical Research Council (NCT02649231)
- Topics
- Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
- Health Sciences › Medicine › Psychiatry and Mental health › Electroconvulsive Therapy Studies
- Social Sciences › Psychology › Clinical Psychology › Psychedelics and Drug Studies
- Keywords
- ketamine, esketamine, dissociation, treatment-resistant depression, antidepressant efficacy, substance use disorders, social anxiety disorder, psychiatric treatment outcomes
- MeSH terms
- Adult, Antidepressive Agents, Mental Disorders, Depressive Disorder, Major, Major Depressive Disorder, Female, Humans, Ketamine, Male, Mental Health, Middle Aged, Psychotropic Drugs, Treatment Outcome, Substance-Related Disorders, Depressive Disorder, Treatment-Resistant
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