Mad Honey Toxicology and Clinical Implications
Summary
“Mad honey” refers to honey containing grayanotoxins, diterpene neurotoxins produced by certain Rhododendron species. These toxins bind to voltage-gated sodium channels in excitable tissues, causing prolonged depolarisation, increased vagal tone and cholinergic overstimulation. Clinically, ingestion leads to dizziness, nausea, vomiting, profound hypotension, bradycardia and various degrees of atrioventricular block. In most cases the syndrome is self-limiting, but severe presentations may require atropine administration, intravenous fluids or temporary pacing. Mad honey has been used historically for both medicinal and recreational purposes, and incidents continue in endemic regions such as the Black Sea coast, Nepal and parts of Japan. Increasing commercial availability via online markets and growing interest in traditional remedies have broadened exposure beyond classical foci. From a public health perspective, improved surveillance, rapid point-of-care diagnostics and education of healthcare providers are essential. Future efforts should also characterise toxin profiles across geographies and investigate potential therapeutic windows for controlled grayanotoxin use in cardiovascular or neurological disorders.
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Mad Honey Toxicology and Clinical Implications publication trend
The graph below shows the total number of articles in mad honey toxicology and clinical implications across all publications each year (not limited to Nature Index journals).
Technical terms
Grayanotoxin: diterpene neurotoxin from Rhododendron nectar that binds to voltage-gated sodium channels, causing prolonged depolarisation.
Bradycardia: abnormally slow heart rate, typically defined as fewer than 60 beats per minute in adults.
Atrioventricular block: impairment of electrical conduction between the atria and ventricles, leading to delayed or absent ventricular depolarisation.
Vagal tone: degree of parasympathetic nervous system activity influencing heart rate and atrioventricular conduction.
References
- Mad Honey and the Poisoner King: A Case of Mass Grayanotoxin Poisoning in the Roman Military. Cureus (2023).
- Grayanotoxin Poisoning: ‘Mad Honey Disease’ and Beyond. Cardiovascular Toxicology (2012).
- The Black Sea’s poison; Mad Honey. Journal of Research in Clinical Medicine (2017).
- Mad Honey Poisoning in Nepal: A Case Report. Clinical Case Reports (2025).
- Mad Honey Poisoning Case Series Presenting With ECG Findings Including Atrioventricular Complete Block and Symptomatic Hypotension. Cureus (2021).
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