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Tea
Tea
Tea (Camellia sinensis) — including black, green, white, and oolong teas — contains methylxanthines: caffeine and theophylline. Cats are significantly more sensitive to methylxanthines than humans, and even small amounts of strong tea can cause neurological and cardiac stimulation. Theophylline is particularly notable as it has a narrow margin between therapeutic and toxic doses.
Important Notes
Toxic compounds: caffeine and theophylline (methylxanthines); concentration varies by tea type — black tea > green tea > white tea
Mechanism: methylxanthines antagonise adenosine receptors and inhibit phosphodiesterase, causing stimulation of the CNS and heart
Symptoms: restlessness, rapid breathing, elevated heart rate (tachycardia), vomiting, tremors, seizures; severe cases cause cardiac arrhythmias
Used tea bags still contain significant caffeine — keep used and fresh tea bags away from cats
Herbal teas (chamomile, mint) have separate toxicity concerns; do not assume any tea is safe
Potentially Toxic Parts
Powder
Leaf
Possible Symptoms Reported in Cats
Severe Neurological Overstimulation
Neurological · 2 to 12 hours (progressing as the toxins are fully absorbed)
Cardiovascular Dysfunction
Cardiac · 2 to 12 hours
Respiratory Distress
Respiratory · 6 to 12 hours (often in the mid to terminal phases)
Hyperthermia
Neurological · 6 to 12 hours
Gastrointestinal Upset (Vomiting and Diarrhea)
Gastrointestinal · 2 to 12 hours (often within 2 to 4 hours as the initial sign of toxicity)
Increased Thirst and Urination
Renal · 2 to 12 hours (often follows initial gastrointestinal signs)
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.