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A neurotoxin found in the nectar of certain rhododendrons and related plants, such as some laurels of the genus Kalmia, and in unpasteurized honey produced from such nectar, and causing temporary effects such as nausea, vomiting, dizziness, and irregular heartbeat if ingested.

[New Latin (Leucothoē) grayāna, species name (after Asa Gray) + toxin.]
References in periodicals archive ?
AbstractMad honey intoxication or grayanotoxin poisoning is caused by consumption of grayanotoxin-containing toxic honey produced from leaves and flowers of the Rhododendron family.
Keywords: Mad honey intoxication Grayanotoxin- containing toxic honey Myocardial infarction.
IntroductionThe mad honey intoxication appears to be a clinical manifestation of use of grayanotoxin (GTX) isolated from the honey made by bees from the Rhododendron plant flowers mainly Ericaceae and Sapindaceae families.
And, he suggested that, with the growing consumption of imported and unprocessed "natural" honey worldwide, the possibility of honey intoxication should be kept in mind whenever a healthy person has an unexplained drop in blood pressure and heart rate.
Mad honey intoxication is generally a benign condition.
A case with complete atrioventricular block related to mad honey intoxication.