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Updated: Feb 19, 2026

Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay
Published on: September 7, 2015
Rabbit syndrome after taking herbicide containing 2-(4-chloro2-methylphenoxypropionic) acid
Takeshi Kitamoto1, Yoshito Kamijo1
1Department of Emergency and Critical Care Medicine School of Medicine Kitasato University Sagamihara Kanagawa Japan.
Case:
A 48-year-old woman attempted to commit suicide by ingesting a herbicide containing 4-chloro-2-methylphenoxypropionic acid. She was transferred to the emergency center. During this time, involuntary movements of her lips at approximately 5 Hz were observed, mimicking the chewing movements of a rabbit.
Outcome:
The symptom resolved in concert with the decrease in her blood concentration of the herbicide.
Conclusion:
It was suspected that the ingestion of 4-chloro-2-methylphenoxypropionic acid may have been associated with development of the rabbit syndrome.
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