Caffeine (coffee, tea, energy drinks, some medications)
⚠ If exposure just happened
Contact your vet or an animal poison control hotline immediately — don't wait to see if symptoms develop. Bring packaging or plant material with you if possible.
How Much Is Dangerous
The reported toxic range for caffeine in cats is roughly 100–150 mg/kg body weight, with lethal doses higher still, but concentrated sources — coffee grounds themselves (rather than brewed coffee), a partial energy drink, or caffeine-containing pills — can deliver a meaningful dose in a surprisingly small volume, meaning even a few licked-up coffee grounds or a small amount of an energy drink can represent a real concern for a small cat.
Symptoms
- Restlessness and hyperactivity
- Vomiting
- Increased heart rate
- Rapid breathing
- Muscle tremors progressing to seizures in more significant ingestions
- Increased thirst and urination
Time to Symptoms
Usually within 1–2 hours of ingestion, broadly similar to the timeline seen with chocolate/theobromine toxicity given the shared methylxanthine mechanism.
First Aid Steps
- Contact a veterinarian promptly, specifically noting the source involved — brewed coffee, coffee grounds, tea, an energy drink, or a medication — since these vary enormously in caffeine concentration and this genuinely changes the urgency assessment
- Do not induce vomiting at home without veterinary guidance
What Not To Do
- Do not leave coffee grounds, used or unused tea bags, or energy drinks within reach of a curious cat — grounds and other concentrated sources represent a considerably higher dose per volume than a diluted brewed beverage would
Veterinary Treatment
Decontamination if caught early, IV fluids, continuous heart rhythm monitoring, and medication to control tremors or seizures as needed for more significant cases. Activated charcoal may be given in repeated doses given methylxanthines' enterohepatic recirculation, similar to the approach used for chocolate/theobromine toxicity.
Toxic Compound
Caffeine, another methylxanthine compound sharing the same broad mechanism of action as theobromine in chocolate — stimulating the central nervous system and cardiovascular system — and, like theobromine, cleared relatively slowly by cats compared to some other species. Energy drinks and some over-the-counter diet pills or medications can contain concentrated caffeine doses considerably higher than what's found in a typical cup of brewed coffee or tea, which matters when assessing how serious a given exposure actually is.