What are the symptoms if a cat eats Mountain Laurel?

Vomiting, diarrhea, inappetence (loss of appetite), abdominal pain, and hypersalivation (drooling), CNS depression, lethargy, and profound muscle weakness, Abnormally slow heart rate (bradycardia), irregular heart rhythms (arrhythmias), and low blood pressure (hypotension), Muscle tremors and seizures, Transient (temporary) blindness

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✕ Toxic

Mountain Laurel

Q: Is Mountain Laurel toxic to cats?

Warning: Toxic. Mountain Laurel (Kalmia latifolia) is an evergreen shrub related to rhododendrons and azaleas. It is highly toxic and very dangerous to cats, as every single part of the plant is poisonous, including the flowers, leaves, and even the nectar. The plant contains grayanotoxins, which disrupt the normal electrical signals in a cat's body. These toxins keep the cells in the heart, nerves, and muscles stuck in an active state, causing the body's systems to malfunction. Eating even a tiny amount can cause severe symptoms like heavy drooling, vomiting, loss of coordination, seizures, and a dangerously slow heart rate. Mountain laurel poisoning is a medical emergency that can be fatal. If your cat touches or eats any part of this plant, contact a veterinarian immediately.

Kalmia latifolia

Mountain Laurel (Kalmia latifolia) is an evergreen shrub related to rhododendrons and azaleas. It is highly toxic and very dangerous to cats, as every single part of the plant is poisonous, including the flowers, leaves, and even the nectar. The plant contains grayanotoxins, which disrupt the normal electrical signals in a cat's body. These toxins keep the cells in the heart, nerves, and muscles stuck in an active state, causing the body's systems to malfunction. Eating even a tiny amount can cause severe symptoms like heavy drooling, vomiting, loss of coordination, seizures, and a dangerously slow heart rate. Mountain laurel poisoning is a medical emergency that can be fatal. If your cat touches or eats any part of this plant, contact a veterinarian immediately.

Important Notes

Toxic compounds: grayanotoxins I, II, and III; all parts toxic — leaves, flowers, nectar, pollen, and berries

Mechanism: grayanotoxins hold voltage-gated sodium channels open, causing sustained membrane depolarisation in cardiac and skeletal muscle; this leads to hypotension, bradycardia, and arrhythmias

Symptoms: profuse drooling, vomiting, diarrhea, severe weakness, loss of coordination, abnormally slow heart rate, tremors, seizures; can be fatal without treatment

Even small amounts of leaves or flowers can cause serious cardiac effects in cats

Any suspected ingestion is a veterinary emergency

Potentially Toxic Parts

Leaf

Flower

Possible Symptoms Reported in Cats

Abnormally slow heart rate (bradycardia), irregular heart rhythms (arrhythmias), and low blood pressure (hypotension)

Cardiac · Within 1 to 4 hours (up to 12 hours)

CNS depression, lethargy, and profound muscle weakness

Neurological · Within 1 to 4 hours (up to 12 hours)

Muscle tremors and seizures

Neurological · Within 1 to 4 hours (up to 12 hours)

Transient (temporary) blindness

Neurological · Within 1 to 4 hours (up to 12 hours)

Vomiting, diarrhea, inappetence (loss of appetite), abdominal pain, and hypersalivation (drooling)

Gastrointestinal · Within 1 to 4 hours (and occasionally up to 12 hours) after ingestion

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.