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Is Acetaminophen Toxic to Cats? What to Do

PawAI Lab
5 min read

Learn whether acetaminophen poses a toxicity risk to cats, what signs may appear after exposure, and what immediate steps to take if your cat may have been exposed.

Quick Answer

Yes, acetaminophen is toxic to cats. Acetaminophen is EXTREMELY toxic to cats, far more than to dogs. Cats lack the liver enzyme needed to metabolize it safely. Even a single tablet can be fatal. If your cat may have been exposed, contact a veterinarian or animal poison-control service right away, even if no signs are visible yet.

Before using any tool, contact a veterinary professional if your cat may have been exposed.

  • US: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • UK: Animal PoisonLine (01202 509000) or your nearest veterinary emergency clinic
  • Canada: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • AU: Animal Emergency Centre or your regular vet
  • EU: Contact your nearest veterinary emergency service

TOXICITY CHECKER

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Safety Verdict

Toxic. Acetaminophen is metabolized differently in cats than in humans. Cats lack the enzyme glucuronyl transferase needed to safely process the drug. This causes methemoglobinemia, where hemoglobin cannot carry oxygen, and liver damage. Even very small doses can be fatal to cats.

Acetaminophen is EXTREMELY toxic to cats, far more than to dogs. Cats lack the liver enzyme needed to metabolize it safely. Even a single tablet can be fatal. Never give acetaminophen to a cat under any circumstances.

What It Is

Acetaminophen (also called paracetamol or Tylenol) is a common human pain reliever and fever reducer. It is extremely toxic to cats, who lack the enzyme needed to metabolize it safely, causing methemoglobinemia and liver damage.

Why It May Be Harmful

The toxic principle in acetaminophen is acetaminophen (paracetamol). Acetaminophen is metabolized differently in cats than in humans. Cats lack the enzyme glucuronyl transferase needed to safely process the drug. This causes methemoglobinemia, where hemoglobin cannot carry oxygen, and liver damage. Even very small doses can be fatal to cats.

Signs of toxicity may include:

  • Brown or blue gums
  • Difficulty breathing
  • Swelling of face or paws
  • Vomiting
  • Lethargy
  • Weakness
  • Yellowing of skin or eyes
  • Collapse

Timeline: Signs can appear within hours of ingestion.

Extremely life-threatening. Even small doses can be fatal to cats.

What to Do If Your Cat Eats It

  1. Contact a veterinarian or animal poison-control service immediately.
  2. Remove any remaining substance from your cat's reach.
  3. Do not induce vomiting unless instructed by a veterinarian.
  4. Do not give food, milk, charcoal, or home remedies.
  5. Bring the substance, plant, or packaging for identification.

Information to have ready when you call:

  • Your cat's age, approximate weight, and any health conditions
  • The name or type of acetaminophen and the estimated amount consumed
  • When the exposure likely occurred
  • Any current symptoms your cat is showing
  • The product packaging or a photo of the plant if applicable

Any ingestion of acetaminophen by a cat should be treated as an emergency. Do not wait for signs to develop.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service immediately if your cat may have been exposed to acetaminophen. Do not wait for symptoms to develop.

Emergency signs that require urgent veterinary attention:

  • Brown, blue, or pale gums
  • Difficulty breathing
  • Facial swelling
  • Collapse
  • Yellowing of skin or eyes

Non-urgent follow-up: Any ingestion of acetaminophen by a cat should be treated as an emergency. Do not wait for signs to develop.

FAQ

Is acetaminophen (Tylenol) safe for cats?

No. Acetaminophen is extremely toxic to cats and can be fatal even in small doses. Cats lack the enzyme to metabolize it safely, causing methemoglobinemia and liver damage. Never give Tylenol to a cat.

How much acetaminophen is lethal to a cat?

Even a single regular-strength tablet can be fatal to a cat. There is no safe dose of acetaminophen for cats without veterinary supervision.

Can acetaminophen poisoning be treated?

Treatment may include N-acetylcysteine (a specific antidote), IV fluids, oxygen therapy, blood transfusions, and supportive care. Time is critical for successful treatment.

TOXICITY CHECKER

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This tool provides general safety information and does not replace veterinary advice.

Sources

Disclaimer

This article and the PawAI Toxicity Checker tool provide general safety information and do not replace examination, diagnosis, or treatment by a licensed veterinarian. If your cat may have ingested a toxic substance, contact a veterinarian, emergency clinic, or animal poison control immediately.