Cited by 6Complementary and Alternative Medicine StudiesPharmacovigilance and Adverse Drug ReactionsPlant-based Medicinal Research

Pharmacoepidemiological Data on Drug–Herb Interactions: Serotonin Syndrome, Arrhythmias and the Emerging Role of Artificial Intelligence

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Spanakis, Marios, Bakaros, Evangelos, Papadopoulou, Stella-Natalia, Fournaraki, Agapi, Symvoulakis, Emmanouil K.·2025·Pharmacoepidemiology

Abstract

Herbal medicinal products are increasingly used alongside conventional medicines, raising the risk of potential interactions such as pharmacodynamic drug–herb interactions (PD-DHIs) that can cause serious adverse drug reactions (ADRs). This review aims to present available pharmacological, clinical and pharmacoepidemiological literature regarding potential DHIs associated with serotonin syndrome or cardiac arrhythmias. Furthermore, it assesses the current evidence using the Oxford Centre for Evidence-Based Medicine (CEBM) 2009 framework. Serotonin syndrome most often results from combining serotonergic herbs (e.g., St. John’s wort) with antidepressants like serotonin reuptake inhibitors (SSRIs), as supported by repeated case reports and mechanistic plausibility (CEBM Level 3, Grade C). Other herbs such as black cohosh, ginseng, Syrian rue, turmeric, rhodiola, ashwagandha, and L-tryptophan/5-HTP have been linked to serotonin syndrome when used with SSRIs, serotonin-norepinephrine reuptake inhibitors (SNRIs), or monoamine oxidase inhibitors (MAOIs), but evidence is limited (Levels 4–5, Grade D). For cardiac arrhythmias, PD-DHIs arise when herbs interact with drugs that alter cardiac electrophysiology—such as QT-prolonging agents, psychotropics, antiarrhythmics or digoxin—thereby amplifying arrhythmogenic risk. Ephedra with sympathomimetics is strongly associated with arrhythmias (Level 2–3, Grade B). Licorice may potentiate digoxin and QT-prolonging drugs via hypokalemia (Level 4, Grade C). Other related PD-DHIs include aconite with antiarrhythmics, bitter orange or caffeine with QT-prolonging psychotropics, yohimbine with cardiovascular agents, and aloe or senna with digoxin. Overall, the evidence for PD-DHIs varies from moderate to weak but large-scale pharmacoepidemiological data is scarce. Future approaches, including artificial intelligence with explainable machine learning and network pharmacology, may integrate mechanistic, clinical, and real-world data to improve early detection or prediction of PD-DHIs. However, several specific challenges must be addressed. Therefore, it is crucial for healthcare providers in both clinical and community settings to increase their awareness of these interactions and ADRs to ensure the safe use of herbal remedies alongside conventional therapies.

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  • Berberine belongs to the broader group of drugs and supplements with a risk of induced arrhythmia, monitorable through pharmacovigilance, in which the pharmacist's assessment has a preventive role.

    “This places berberine within the broader group of drugs and supplements with a risk of induced arrhythmia, monitorable through pharmacovigilance, in which the pharmacist’s assessment has a preventive role [91,93,94].”

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Research works printed but not linked: 3

  1. Williamson, E.M.; Driver, S.; Baxter, K. Stockley's Herbal Medicines Interactions: A Guide to the Interactions of Herbal Medicines, Dietary Supplements, and Nutraceuticals with Conventional Medicines; Pharmaceutical Press: London, UK, 2009; 423p.
  2. Volpi-Abadie, J.; Kaye, A.M.; Kaye, A.D. Serotonin Syndrome. Ochsner J. 2013, 13, 533. [CrossRef] · DOI
  3. Joshi, K.G.; Faubion, M.D. Mania and Psychosis Associated with St. John's Wort and Ginseng. Psychiatry 2005, 2, 56. [PubMed]

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Authors
Spanakis, M., Bakaros, E., Papadopoulou, S.-N., Fournaraki, A., & Symvoulakis, E. K.
Affiliations
  • University of Crete (GR)
  • University of Thessaly (GR)
  • Community Pharmacists Association of Heraklion, 71201 Heraklion, Greece
  • Community Pharmacists Association of Rethymno, 74132 Rethymno, Greece
Corresponding author
Spanakis, Marios
Venue
Pharmacoepidemiology
Publisher
MDPI AG
Published
2025-10-09
Volume
4
Issue
4
Pages
22
ISSN
2813-0618 (ISSN-L)
OpenAlex
W4414989210
Cited by
6
References
189
Citations by year
2026: 5 · 2025: 1
FWCI
7.41
Type
journal article
Language
en
Open access
Locations
  • Pharmacoepidemiology (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Special Research Account of the UoC (KA 11903)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Complementary and Alternative Medicine Studies
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Pharmacovigilance and Adverse Drug Reactions
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Plant-based Medicinal Research
Keywords
herb-drug interactions, pharmacodynamic interactions, serotonin syndrome, cardiac arrhythmias, herbal medicinal products, adverse drug reactions, Hypericum perforatum, serotonin reuptake inhibitors, QT prolongation, digoxin, Ephedra, licorice, hypokalemia, artificial intelligence, network pharmacology, explainable machine learning, herbal medicine safety, pharmacovigilance

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