Common Bilberry Toxic?

Updated 2026-03-06| 2 min read| 2,333 found this helpful

Ripe common bilberry berries are fully edible and non-toxic for humans, pets, and livestock

Plant leaves contain mild astringent tannins that can cause constipation if eaten in large amounts as forage

No severe or fatal toxicity cases have been recorded for this species across cats, dogs, or horses

FAQ

Is Common Bilberry toxic to Humans?

No adverse effects from ripe berry consumption; excess leaf intake may cause mild constipation and digestive discomfort (Non-toxic)

Is Common Bilberry toxic to Cats?

No confirmed toxic effects reported; large quantities of leaves may trigger mild constipation or temporary digestive upset (Non-toxic)

Is Common Bilberry toxic to Dogs?

No confirmed toxic effects reported; large quantities of leaves may trigger mild constipation or temporary digestive upset (Non-toxic)

Is Common Bilberry toxic to Horses?

Excess leaf consumption may cause constipation and reduced feed efficiency; berries are completely safe to consume (Low)

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Toxicity Details

Humans

Non-toxic

No adverse effects from ripe berry consumption; excess leaf intake may cause mild constipation and digestive discomfort

Cats

Non-toxic

No confirmed toxic effects reported; large quantities of leaves may trigger mild constipation or temporary digestive upset

Dogs

Non-toxic

No confirmed toxic effects reported; large quantities of leaves may trigger mild constipation or temporary digestive upset

Horses

Low

Excess leaf consumption may cause constipation and reduced feed efficiency; berries are completely safe to consume

Toxicity Snapshot

Toxic PartsLeaves (mild adverse effects only; no severe toxicity); Berries are non-toxic and fully edible

Exposure RouteIngestion of large quantities of raw, unprocessed leaves

Toxic CompoundsAstringent tannins (primary active compound causing mild digestive effects)

First Aid & Prevention

First 30 Minutes

• Rinse mouth thoroughly with clean water if large amounts of leaves were ingested
• Offer small quantities of fresh water or electrolyte fluids to reduce astringent effects on the digestive tract
• Monitor for signs of constipation, bloating, or appetite loss over the next 24 hours

Contact Vet Immediately

• Persistent constipation lasting longer than 48 hours after leaf ingestion
• Severe abdominal pain, bloating, or complete loss of appetite in pets or livestock
• Any unexpected severe adverse reactions after consuming large amounts of plant material

Prevention

• Avoid providing large volumes of bilberry leaves as forage for livestock
• Educate wild foragers to properly identify the species before harvesting berries for consumption
• Clear excess bilberry leaf litter from pet and livestock grazing areas if high consumption is a risk

Treatment & Prognosis

• Administer mild laxatives or stool softeners as directed by a healthcare provider or veterinarian for constipation symptoms
• Provide supportive care including hydration and high-fiber feeds to affected animals to restore normal gut motility
• Deliver symptomatic care for any rare secondary digestive complications as needed

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Professional Toxicology

Scientific NameVaccinium myrtillus L.

AliasesEuropean Blueberry、Blue Whortleberry、Heidelbeere、Blaubeere、Schwarzbeere、Myrtille、Mirtillo nero

Toxicity Grade

HumansNon-toxic

CatsNon-toxic

DogsNon-toxic

HorsesLow

Target Organs

Gastrointestinal tract

Mechanism of Action

• Astringent tannins in leaves bind to gastrointestinal tract mucosa, reducing gut motility and leading to constipation

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Ruminants (cattle, sheep, goats): Excess leaf consumption may cause mild constipation and reduced forage digestibility; berries are safe for consumption

Poultry: No reported toxic effects; small quantities of berries can be safely included in regular feed rations

Wild herbivores: Naturally consume small amounts of leaves and berries with no recorded adverse health effects

Confusion Risk

The following plants look similar and may be confused:

Lowbush Blueberry Vaccinium angustifolium

Very similar leaf and berry morphology; both species produce edible berries, so misidentification carries no major health risk

Cowberry (Lingonberry) Vaccinium vitis-idaea

Similar evergreen leaf structure and berry growth habit; both species are edible, so misidentification is low-risk

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Related Toxic Plants

Rhododendron

Rhododendron ponticum

Highly toxic; ingestion of small amounts can cause fatal cardiac and neurological damage in all species

Mountain Laurel

Kalmia latifolia

Severely toxic; ingestion of any plant part can trigger convulsions, respiratory failure, and death

Labrador Tea

Rhododendron groenlandicum

Moderately toxic; excess consumption causes vomiting, dizziness, and severe digestive tract damage

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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.