European buckthorn Toxic?

Updated 2026-03-06| 3 min read| 2,917 found this helpful
Rhamnus catharticus L.
1

All parts of the plant are toxic, with seeds carrying the highest risk of fatal outcomes if ingested

2

Consumption triggers severe gastrointestinal symptoms including violent diarrhea that may be lethal for humans and animals

3

Horses are confirmed to develop severe diarrhea after eating the plant's leaves

FAQ

Is European buckthorn toxic to Humans?

Nausea, vomiting, intestinal colic, diarrhea, skin and mucous membrane irritation; severe potentially fatal diarrhea may occur, particularly after ingestion of seeds (High)

Is European buckthorn toxic to Cats?

No species-specific toxicity data is documented, but ingestion is expected to cause severe gastrointestinal distress consistent with reported human and equine symptoms (High)

Is European buckthorn toxic to Dogs?

No species-specific toxicity data is documented, but ingestion is expected to cause severe gastrointestinal distress consistent with reported human and equine symptoms (High)

Is European buckthorn toxic to Horses?

Severe diarrhea after ingestion of the plant's leaves (High)

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Toxicity Details

Humans
High

Nausea, vomiting, intestinal colic, diarrhea, skin and mucous membrane irritation; severe potentially fatal diarrhea may occur, particularly after ingestion of seeds

Cats
High

No species-specific toxicity data is documented, but ingestion is expected to cause severe gastrointestinal distress consistent with reported human and equine symptoms

Dogs
High

No species-specific toxicity data is documented, but ingestion is expected to cause severe gastrointestinal distress consistent with reported human and equine symptoms

Horses
High

Severe diarrhea after ingestion of the plant's leaves

Toxicity Snapshot

Toxic PartsAll parts of the plant
Exposure RouteIngestion of plant material, direct skin or mucous membrane contact with plant tissues
Toxic CompoundsCyclopeptide alkaloids; Benzylisoquinoline alkaloids; Anthracene derivatives; Anthracene/naphthalene compounds

First Aid & Prevention

First 30 Minutes

  • • If ingested and the exposed individual/animal is fully conscious, induce vomiting to remove remaining plant material
  • • Rinse skin or mucous membrane exposure sites with cool, clean running water for at least 15 minutes
  • • Remove all visible remaining plant fragments from the mouth of the exposed person or animal

Contact Vet Immediately

  • • Any confirmed or suspected ingestion of the plant, especially seeds
  • • Development of symptoms including vomiting, diarrhea, colic, or skin irritation
  • • Ingestion by horses, as they are at documented risk of severe adverse effects

Prevention

  • • Remove European buckthorn plants from areas accessible to children, pets, and grazing livestock
  • • Wear waterproof protective gloves when handling the plant to avoid skin irritation
  • • Educate foragers and gardeners to correctly identify this species to avoid accidental exposure

Treatment & Prognosis

  • • Administer decontamination measures such as activated charcoal as directed by a medical or veterinary professional
  • • Provide symptomatic care including fluid and electrolyte replacement to address dehydration from severe diarrhea
  • • Administer anti-emetics and anti-spasmodic medications as needed to control vomiting and intestinal colic
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Professional Toxicology

Scientific NameRhamnus catharticus L.
AliasesCommon buckthorn、Purging buckthorn
Toxicity Grade
HumansHigh
CatsHigh
DogsHigh
HorsesHigh
Target Organs
Gastrointestinal tractSkinMucous membranes
Mechanism of Action

• Anthracene derivatives in the plant irritate the gastrointestinal mucosa, causing inflammation and increased intestinal motility leading to diarrhea

• Alkaloid compounds contribute to mucosal irritation and potential systemic toxic effects

• Severe prolonged diarrhea can lead to dangerous dehydration, electrolyte imbalance, and potentially fatal shock

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: No specific data documented, but ingestion is expected to cause severe gastrointestinal distress including diarrhea and colic
Sheep and goats: Expected to experience similar gastrointestinal toxic effects as horses if the plant is ingested
Confusion Risk

The following plants look similar and may be confused:

Other Rhamnus species Rhamnus spp.
Taxonomically and visually similar to Rhamnus catharticus; all species in this genus are highly toxic, with consistent gastrointestinal irritant effects
Cascara buckthorn Frangula purshiana
Visually similar to European buckthorn, both are highly toxic and produce equivalent severe gastrointestinal symptoms when ingested
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Data Sources

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

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