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Elderberry
Sambucus spp. including Sambucus nigra and Sambucus racemosa
Elderberry (Sambucus spp.) is a shrub or small tree with clusters of white flowers and dark, blue, or red berries. It should not be given to cats. Plant parts, uncooked berries, and elderberry supplements can upset a cat's stomach and may be unsafe. The concern is a mix of cyanogenic glycosides, which can release small amounts of cyanide, and irritating terpenoid compounds. Leaves, stems, bark, roots, seeds, and unripe or uncooked berries are higher-risk parts. For cats and other companion animals, vomiting and diarrhea are more likely than true cyanide poisoning, but large amounts or concentrated supplements still need urgent veterinary advice. Possible signs include drooling, vomiting, diarrhea, belly discomfort, weakness, or low energy. More serious signs such as fast breathing, tremors, seizures, or collapse are unusual but possible after a larger exposure. Keep elderberry plants, raw berries, syrups, gummies, and supplements away from cats, and call a veterinarian or pet poison helpline if ingestion is suspected.
Important Notes
Main risk: Plant parts and uncooked berries contain cyanide-containing glycosides and irritating terpenoids.
Avoid supplements: Do not give elderberry syrup, gummies, tea, or capsules unless a vet specifically directs it.
Symptoms: Vomiting, diarrhea, drooling, low energy, or belly discomfort are the most likely signs.
Action: Call a vet or poison helpline after plant-part, raw-berry, or supplement ingestion, especially if the amount is unknown.
Potentially Toxic Parts
Root
Stem
Bark
Seed
Leaf
Fruit
Possible Symptoms Reported in Cats
Fast breathing, tremors, seizures, or collapse
Neurological · Unusual, but possible after larger exposure.
Vomiting, diarrhea, nausea, or drooling
Gastrointestinal · Can appear soon after eating plant parts, uncooked berries, or supplements.
Low energy, weakness, or belly discomfort
Other · May appear with or after stomach upset.
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.