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Hesperidin and diazepam exhibit synergistic interaction in enhancing sedative and sleep-enhancing effects

The study demonstrates that the natural flavonoid hesperidin, which has sedative and sleep-enhancing properties but does not bind to the benzodiazepine site, synergistically potentiates the effects of diazepam, a GABA(A) receptor agonist. Isobolar analysis confirmed the interaction as synergistic, and pharmacokinetic effects or direct action on the benzodiazepine site were ruled out.

Last updated: Aug 25, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score26/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Synergistic interaction between hesperidin, a natural flavonoid, and diazepam.

observational

Fernández SP, Wasowski C, Paladini AC, Marder M · European journal of pharmacology (2005)

Participants: N/A
Duration: N/A
Intervention: Hesperidin combined with diazepam
Outcome: Sedative and sleep-enhancing effects measured via the hole board test
Effect Size: N/A (synergistic interaction reported via isobolar analysis, no specific effect size given)
Population: Animal subjects (likely rodents, based on typical preclinical sleep research)

Result:

PubMed: 15840404DOI: 10.1016/j.ejphar.2005.02.039

Mechanism Graph

Hesperidin has sedative and sleep-enhancing properties independent of benzodiazepine binding
↓
Diazepam acts as an agonist at the GABA(A) receptor benzodiazepine binding site
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Combined administration produces synergistic interaction as shown by isobolar analysis
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Result: Enhanced sedative and sleep-enhancing effects beyond additive expectations

Limitations

  • ⚠Study conducted in animals, not humans, limiting direct applicability
  • ⚠Abstract does not report specific sample size, doses, or statistical details for replication

Frequently Asked Questions

What is hesperidin?▼

Hesperidin is a natural flavonoid found in plants like Valeriana, with sedative and sleep-enhancing properties.

Does hesperidin bind to benzodiazepine receptors?▼

No, the abstract states hesperidin is not a ligand for the benzodiazepine binding site on GABA(A) receptors.

What was the main finding of this study?▼

Hesperidin and diazepam showed synergistic interaction in enhancing sedative effects, suggesting potential to reduce diazepam doses.

Was this study done in humans?▼

No, the abstract indicates it was an animal study using the hole board test.

Products

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References

  1. 1.Fernández SP, Wasowski C, Paladini AC, Marder M. "Synergistic interaction between hesperidin, a natural flavonoid, and diazepam.." European journal of pharmacology, 2005. PMID: 15840404 DOI: 10.1016/j.ejphar.2005.02.039
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.