Japanese spindle Toxic?

Updated 2026-03-06| 5 min read| 3,802 found this helpful

All plant parts are toxic, with fruits containing the highest concentration of harmful compounds

Ingestion can cause vomiting, diarrhea, colic, cardiac dysfunction, and potentially fatal outcomes, particularly in horses

Toxic compounds remain active in dried hay, creating year-round risk for grazing livestock

FAQ

Is Japanese spindle toxic to Humans?

Vomiting, diarrhea, abdominal cramping, abnormal heart rhythm, and circulatory distress following ingestion (High)

Is Japanese spindle toxic to Cats?

Vomiting, diarrhea, lethargy, abdominal pain, and potential cardiac arrhythmia after ingestion (High)

Is Japanese spindle toxic to Dogs?

Vomiting, diarrhea, abdominal discomfort, lethargy, and possible cardiovascular complications (High)

Is Japanese spindle toxic to Horses?

Colic, peritonitis, constipation, rapid heart rate, and potential death within several days of ingesting branch tips (High)

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Toxicity Details

Humans

High

Vomiting, diarrhea, abdominal cramping, abnormal heart rhythm, and circulatory distress following ingestion

Cats

High

Vomiting, diarrhea, lethargy, abdominal pain, and potential cardiac arrhythmia after ingestion

Dogs

High

Vomiting, diarrhea, abdominal discomfort, lethargy, and possible cardiovascular complications

Horses

High

Colic, peritonitis, constipation, rapid heart rate, and potential death within several days of ingesting branch tips

Toxicity Snapshot

Toxic PartsAll plant parts, particularly the fruits

Exposure RouteIngestion of fresh plant material or dried plant matter contaminated in hay

Toxic CompoundsCardenolide-type steroid glycosides (evonoside, evobioside, evomonoside); Evonine alkaloid; Lectins; Triterpenes

First Aid & Prevention

First 30 Minutes

• Induce vomiting only if ingestion occurred within 2 hours and the affected party is fully conscious and alert
• Administer activated charcoal to bind unabsorbed toxic compounds in the gastrointestinal tract
• Keep the affected individual calm and restrict physical activity to reduce strain on the cardiovascular system

Contact Vet Immediately

• Immediately contact a medical or veterinary professional if any amount of the plant is ingested
• Seek urgent care if symptoms like vomiting, diarrhea, colic, or abnormal heart rate develop after exposure
• Contact an equine veterinarian immediately if a horse is suspected to have ingested any part of the plant

Prevention

• Remove Japanese spindle plants from areas accessible to children, pets, and grazing livestock
• Routinely inspect hay supplies for contamination with Japanese spindle material, as toxins remain active when dried
• Educate caregivers and farm workers to recognize the plant to avoid accidental exposure

Treatment & Prognosis

• Perform gastrointestinal decontamination via induced vomiting and activated charcoal administration as clinically appropriate
• Provide symptomatic supportive care including fluid therapy, anti-emetics, pain management, and cardiac support as needed
• Monitor vital signs and cardiac function closely for at least 72 hours post-ingestion, especially in equine cases

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Professional Toxicology

Scientific NameEuonymus japonicus Thunb.

AliasesEvergreen spindle、Japanese euonymus

Toxicity Grade

HumansHigh

CatsHigh

DogsHigh

HorsesHigh

Target Organs

Gastrointestinal tractHeartCirculatory systemPeritoneum (in horses)

Mechanism of Action

• Cardenolide glycosides inhibit cardiac sodium-potassium pump function, leading to abnormal heart rhythm and circulatory failure

• Alkaloids and lectins irritate the gastrointestinal mucosa, causing inflammation, vomiting, diarrhea, and abdominal pain

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Sheep: Confirmed poisoning cases reported after ingestion of the plant's branches, leaves, and fruits

Goats: Confirmed poisoning cases reported after ingestion of the plant's branches, leaves, and fruits

Confusion Risk

The following plants look similar and may be confused:

Other spindle species Euonymus spp.

Other Euonymus species share similar leaf and fruit morphology with Japanese spindle; most have comparable toxicity profiles, so differentiation is not required for risk assessment

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Related Toxic Plants

Oriental bittersweet

Celastrus orbiculatus

Moderately toxic

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Data Sources

1. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.