Common box Toxic?

Updated 2026-03-06| 4 min read| 1,764 found this helpful

All parts of the plant are highly toxic to humans and multiple animal species, including livestock.

Primary toxic compounds are a mix of alkaloids, dominated by buxin (cyclobuxin), that damage the digestive tract and nervous system.

Untreated ingestion can lead to fatal respiratory paralysis, so immediate medical/veterinary care is critical after exposure.

FAQ

Is Common box toxic to Humans?

Vomiting, severe (sometimes bloody) diarrhea, abdominal pain, dehydration, collapse, ataxia, dizziness, convulsions, swallowing difficulty from oropharyngeal paralysis, CNS paresis/paralysis, coma, death from respiratory paralysis (High)

Is Common box toxic to Cats?

Species-specific toxicity data is not explicitly documented, but ingestion is expected to cause gastrointestinal distress and neurological symptoms similar to those seen in humans; seek veterinary care immediately if ingestion is suspected (High)

Is Common box toxic to Dogs?

Is Common box toxic to Horses?

Species-specific toxicity data is not explicitly documented, but ingestion is expected to cause gastrointestinal distress and neurological symptoms similar to those seen in livestock; seek veterinary care immediately if ingestion is suspected (High)

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Toxicity Details

Humans

High

Cats

High

Dogs

High

Horses

High

Species-specific toxicity data is not explicitly documented, but ingestion is expected to cause gastrointestinal distress and neurological symptoms similar to those seen in livestock; seek veterinary care immediately if ingestion is suspected

Toxicity Snapshot

Toxic PartsAll parts of the plant

Exposure RouteIngestion is the primary high-risk exposure route; prolonged contact with plant sap may cause mild skin irritation in sensitive individuals

Toxic CompoundsBuxin (cyclobuxin, primary alkaloid); Buxanin; Buxatin; Buxandrin; Other related alkaloids

First Aid & Prevention

First 30 Minutes

• Remove any remaining plant material from the exposed individual's mouth and rinse thoroughly with clean water
• Do not induce vomiting unless explicitly instructed to do so by a qualified medical or veterinary provider
• Collect a sample of the ingested plant to confirm identification for care providers

Contact Vet Immediately

• Any confirmed or suspected ingestion of the plant, even if no symptoms are present
• Development of symptoms including vomiting, diarrhea, difficulty breathing, seizures, or paralysis after exposure
• Exposure occurs in high-risk groups including children, companion animals, or grazing livestock

Prevention

• Keep common box plants out of reach of children, pets, and livestock, and avoid planting it in grazing areas
• Wear protective gloves when pruning or handling the plant to avoid contact with irritant sap
• Educate household members and animal caregivers about the toxic nature of this plant to prevent accidental ingestion

Treatment & Prognosis

• Administer decontamination measures such as activated charcoal as directed by a medical/veterinary provider
• Provide supportive symptomatic care including fluid therapy for dehydration, seizure control, and respiratory support as needed
• Do not administer neuroleptic medications, as they may worsen neurological complications

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Professional Toxicology

Scientific NameBuxus sempervirens L.

AliasesEuropean box、Boxwood、Gemeiner Buchsbaum、Buis、Bosso comune

Toxicity Grade

HumansHigh

CatsHigh

DogsHigh

HorsesHigh

Target Organs

Gastrointestinal tractCentral nervous systemRespiratory system

Mechanism of Action

• Toxic alkaloids irritate the gastrointestinal mucosa, causing vomiting, diarrhea, and abdominal pain

• Alkaloids act on the central nervous system, leading to paralysis, seizures, and impaired respiratory function

• Oropharyngeal paralysis impairs swallowing, increasing risk of secondary respiratory complications

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Ingestion causes diarrhea, dehydration, staggering, oropharyngeal paralysis, and potentially death

Pig: Ingestion causes difficulty breathing, tonic-clonic seizures, severe pain, and death

Confusion Risk

The following plants look similar and may be confused:

Cotoneaster species Cotoneaster sp.

Visually similar to common box in leaf shape and dense evergreen growth habit. Cotoneaster is only low toxicity, while common box is highly toxic. Key difference: cotoneaster produces bright red/orange fleshy berries, while common box produces small, inconspicuous greenish flowers and woody seed capsules.

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Related Toxic Plants

Japanese boxwood

Buxus microphylla

Highly toxic

Sweet box

Sarcococca hookeriana

Moderately toxic

Japanese pachysandra

Pachysandra terminalis

Low to 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.