Cited by 10Attention Deficit Hyperactivity DisorderNeurotransmitter Receptor Influence on BehaviorAutism Spectrum Disorder Research

Role of serotonin in psychiatric and somatic comorbidities of attention-deficit/hyperactivity disorder: a systematic literature review

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Faraone, Stephen V., Ward, Caroline L., Boucher, Matthieu, Elbekai, Reem, Brunner, Elizabeth·2025·Neuroscience & Biobehavioral Reviews

Abstract

INTRODUCTION: Serotonin is a well-established modulator of various neuropsychological processes, as well as organ and endocrine functioning, and metabolism and homeostasis. Serotonin has been implicated in the neurobiology of attention-deficit/hyperactivity disorder (ADHD). Herein, the evidence for a serotonergic link between psychiatric and somatic comorbidities associated with ADHD was evaluated. METHODS: A systematic literature review was conducted of the published literature to identify comorbidities proven to co-occur with ADHD and determine whether there was any serotonergic pathophysiology associated with these comorbidities. The average grade of serotonergic evidence was calculated and plotted alongside the volume of publications for each identified comorbidity. The date of the last search was 7 March 2024. RESULTS: One hundred eighty-two individual comorbidities commonly occurring in ADHD populations were identified; 135 (74.2 %) had evidence for serotonergic pathophysiology, including 91 psychiatric and 44 somatic conditions. The grade of evidence for a serotonergic role in the pathophysiology of a given comorbidity was generally medium to high or high. CONCLUSIONS: Findings indicate that serotonin plays a key role, alongside dopamine and norepinephrine, in ADHD neurobiology. Serotonin involvement in physiological functioning suggests that dysregulation is likely to generate a broad spectrum of clinical manifestations, which may account for the unique presentation of neuropsychiatric behaviors and comorbidities found in patients with ADHD.

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Crossref · 10.1016/j.neubiorev.2025.106275

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  • The serotonergic system has been implicated in ADHD, particularly in relation to impulsivity and high rates of comorbid mood and anxiety disorders.

    “The serotonergic (5-HT) system has also been implicated, particularly in relation to impulsivity and the high rates of comorbid mood and anxiety disorders”

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Authors
Faraone, S. V., Ward, C. L., Boucher, M., Elbekai, R., & Brunner, E.
Affiliations
  • SUNY Upstate Medical University (US)
  • Otsuka Pharmaceutical Development & Commercialization, Inc. (United States) (US)
  • Otsuka Canada Pharmaceutical Inc. (Canada) (CA)
  • Otsuka (United States) (US)
Corresponding author
Faraone, Stephen V.
Venue
Neuroscience & Biobehavioral Reviews
Publisher
Elsevier BV
Published
2025-09
Volume
176
Pages
106275
ISSN
0149-7634 (ISSN-L)
OpenAlex
W4412055753
Cited by
10
References
79
Citations by year
2026: 7 · 2025: 3
FWCI
1.81
Type
journal article
Language
en
Open access
Locations
  • Neuroscience & Biobehavioral Reviews (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
Otsuka Pharmaceutical Development and Commercialization Inc
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
Keywords
serotonin, attention deficit hyperactivity disorder, psychiatric comorbidity, somatic comorbidity, dopamine, norepinephrine
MeSH terms
Attention Deficit Disorder with Hyperactivity, Mental Disorders, Humans, Serotonin, Comorbidity

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