Cited by 100Treatment of Major DepressionAnxiety, Depression, Psychometrics, Treatment, Cognitive ProcessesNeurotransmitter Receptor Influence on Behavior

A mega-analysis of fixed-dose trials reveals dose-dependency and a rapid onset of action for the antidepressant effect of three selective serotonin reuptake inhibitors

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Hieronymus, F, Nilsson, S, Eriksson, E·2016·Translational Psychiatry

Abstract

The possible dose-dependency for the antidepressant effect of selective serotonin reuptake inhibitors (SSRIs) remains controversial. We believe we have conducted the first comprehensive patient-level mega-analysis exploring this issue, one incentive being to address the possibility that inclusion of low-dose arms in previous meta-analyses may have caused an underestimation of the efficacy of these drugs. All company-sponsored, acute-phase, placebo-controlled, fixed-dose trials using the Hamilton Depression Rating Scale (HDRS) and conducted to evaluate the effect of citalopram, paroxetine or sertraline in adult major depression were included (11 trials, n=2859 patients). The single-item depressed mood, which has proven a more sensitive measure to detect an antidepressant signal than the sum score of all HDRS items, was designated the primary effect parameter. Doses below or at the lower end of the usually recommended dose range (citalopram: 10-20 mg, paroxetine: 10 mg; sertraline: 50 mg) were superior to placebo but inferior to higher doses, hence confirming a dose-dependency to be at hand. In contrast, among doses above these, there was no indication of a dose-response relationship. The effect size (ES) after exclusion of suboptimal doses was of a more respectable magnitude (0.5) than that usually attributed to the antidepressant effect of the SSRIs. In conclusion, the observation that low doses are less effective than higher ones challenges the oft-cited view that the effect of the SSRIs is not dose-dependent and hence not caused by a specific, pharmacological antidepressant action. Moreover, we suggest that inclusion of suboptimal doses in previous meta-analyses has led to an underestimation of the efficacy of these drugs.

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  1. Angell M. The epidemic of mental illness: why? New York Review of Books 2011; 58: pp 20–22.

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Authors
Hieronymus, F., Nilsson, S., & Eriksson, E.
Affiliations
  • University of Gothenburg (SE)
  • Chalmers University of Technology (SE)
Corresponding author
Eriksson, E
Venue
Translational Psychiatry
Published
2016-06-07
Volume
6
Issue
6
Pages
e834-e834
ISSN
2158-3188 (ISSN-L)
OpenAlex
W2412709103
Cited by
100
References
31
Citations by year
2026: 7 · 2025: 6 · 2024: 7 · 2023: 6 · 2022: 10 · 2021: 18 · 2020: 13 · 2019: 15 · 2018: 5 · 2017: 8 · 2016: 5
FWCI
8.90
Type
journal article
Language
en
Open access
Locations
  • Translational Psychiatry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Chalmers Publication Library (Chalmers University of Technology) (submittedVersion)
  • Chalmers Research (Chalmers University of Technology) (submittedVersion)
Funders
  • Pfizer
  • Sahlgrenska Universitetssjukhuset
  • H. Lundbeck A/S
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
selective serotonin reuptake inhibitors, antidepressant efficacy, dose-response relationship, major depressive disorder, citalopram, paroxetine, sertraline, onset of action, depressive mood, Hamilton Depression Rating Scale
MeSH terms
Adult, Depressive Disorder, Major, Major Depressive Disorder, Dose-Response Relationship, Drug, Humans, Citalopram, Randomized Controlled Trials as Topic, Treatment Outcome, Selective Serotonin Reuptake Inhibitors, Paroxetine, Sertraline

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