What are the symptoms if a cat eats Japanese Pieris?

Vomiting, Diarrhea, Hypersalivation (Drooling), and Anorexia (Refusal to eat), Cardiac Arrhythmias, Bradycardia (slow heart rate), Tachycardia (fast heart rate), and Hypotension (low blood pressure), Weakness, Tremors, Seizures (Convulsions), Ataxia (loss of coordination), Depression, and Coma, Dyspnea (Difficulty breathing), Transient Blindness / Blurred Vision

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✕ Toxic

Japanese Pieris

Q: Is Japanese Pieris toxic to cats?

Warning: Toxic. Japanese Pieris (Pieris japonica), also called lily-of-the-valley shrub or andromeda, is a highly toxic ornamental shrub. It is related to azalea and rhododendron, which are also dangerous for cats. The plant contains grayanotoxins in the leaves, flowers, stems, and nectar. These toxins interfere with normal nerve and muscle signals. They can affect the digestive system, heart, and brain, even when a cat eats only a small amount. Signs may include drooling, vomiting, diarrhea, weakness, slow or irregular heartbeat, tremors, seizures, or collapse. This is an emergency exposure. Keep Japanese Pieris away from cats, and contact a veterinarian or emergency clinic immediately if your cat eats any part of it.

Pieris japonica

Japanese Pieris (Pieris japonica), also called lily-of-the-valley shrub or andromeda, is a highly toxic ornamental shrub. It is related to azalea and rhododendron, which are also dangerous for cats. The plant contains grayanotoxins in the leaves, flowers, stems, and nectar. These toxins interfere with normal nerve and muscle signals. They can affect the digestive system, heart, and brain, even when a cat eats only a small amount. Signs may include drooling, vomiting, diarrhea, weakness, slow or irregular heartbeat, tremors, seizures, or collapse. This is an emergency exposure. Keep Japanese Pieris away from cats, and contact a veterinarian or emergency clinic immediately if your cat eats any part of it.

Important Notes

Toxic compounds: grayanotoxins I, II, and III (diterpenoid polyols); all parts toxic including nectar

Mechanism: grayanotoxins bind to voltage-gated sodium channels, keeping them open; this causes persistent depolarisation of cardiac and skeletal muscle, leading to hypotension, bradycardia, and arrhythmias

Symptoms: profuse drooling, vomiting, diarrhea, severe weakness, loss of coordination, abnormally slow heart rate, low blood pressure, tremors, seizures; can be fatal

Even small ingestions can cause serious cardiac effects in cats

Any suspected ingestion is a veterinary emergency requiring immediate care

Potentially Toxic Parts

Stem

Leaf

Entire Plant

Flower

Possible Symptoms Reported in Cats

Weakness, Tremors, Seizures (Convulsions), Ataxia (loss of coordination), Depression, and Coma

Neurological · 1–4 hours.

Vomiting, Diarrhea, Hypersalivation (Drooling), and Anorexia (Refusal to eat)

Gastrointestinal · 1–4 hours (occasionally up to 12 hours).

Cardiac Arrhythmias, Bradycardia (slow heart rate), Tachycardia (fast heart rate), and Hypotension (low blood pressure)

Cardiac · 1–4 hours.

Dyspnea (Difficulty breathing)

Respiratory · 1–4 hours.

Transient Blindness / Blurred Vision

Neurological · 1–4 hours.

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.