Lithium poisoning in dogs and cats

Why lithium is dangerous

Lithium interferes with nerve signalling and can cause cellular toxicity.

The metal accumulates in the kidneys and heart, leading to rapid organ failure.

Small tablets are easy for pets to swallow unnoticed.

Why speed matters

Delaying care significantly worsens outcomes. Some signs appear hours or days later, so "looks fine right now" is not a reason to wait.

Symptoms of lithium-toxicity poisoning

• repeated vomiting starting 1-4 hours after ingestion
• shaky or trembling limbs by the afternoon
• the eyes appear wide and the pupils dilated within 2-6 hours
• rapid heart rate that can be felt on the chest
• seizures or uncontrolled muscle jerks in the evening
• the pet looks unusually weak or collapses

What to do right now

1. call your vet or an animal poison control line immediately
2. bring the pill bottle or any packaging you have
3. keep the pet calm and monitor breathing and heart rate
4. do not induce vomiting because lithium can cause further gut irritation
5. if seizures start, note the time and be ready to transport to emergency clinic

Sources & further reading

• ASPCA Animal Poison Control — pet poison database & dosage references
• Pet Poison Helpline — toxicology triage guidelines
• Merck Veterinary Manual — toxicology monographs
• Vets Now (UK) — emergency toxicosis guidance

Other poisonings with overlapping signs

• Naproxen Toxicity in Dogs and Cats — shares signs: repeated vomiting starting 1-4 hours after ingestion
• Magnet Ingestion in Dogs and Cats — another common emergency
• Permethrin Toxicity in Cats — another common emergency

Owners also ask

• My 5 kg dog ate a naproxen tablet — is it urgent?
• How long should I monitor my 8 kg dog after the vet removes a swallowed fridge magnet?

Frequently asked questions

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