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Paracetamol poisoning in cats
Paracetamol, also called acetaminophen, is a human painkiller very common in medicine cabinets. For cats, it is a violent poison: their liver does not have the necessary equipment to eliminate this molecule, unlike that of humans. A very sm...
What is it?
Paracetamol, also called acetaminophen, is a human painkiller very common in medicine cabinets. For cats, it is a violent poison: their liver does not have the necessary equipment to eliminate this molecule, unlike that of humans.
A very small amount, much less than an adult would swallow without problem, is enough to put a cat's life in danger. NEVER give paracetamol to a cat, under any circumstances, even if it appears to be in pain, even while waiting for an appointment with the veterinarian.
The non-eliminated product attacks two targets: the red blood cells, which no longer transport oxygen, and the liver, which is destroyed.
Key point
Immediate life-threatening emergency. Paracetamol is fatal for cats even in very small quantities. It should NEVER be given to him.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
The first signs often appear within a few hours of taking it.
Profuse salivation, drooling, sometimes vomiting.
Marked depression: the cat hides, no longer responds to requests.
Rapid and difficult breathing, even though the cat has not exerted itself.
The gums and the inside of the lips take on an abnormal color, bluish-gray or brownish, instead of the usual pink: this is a major warning sign.
Swelling of the face, chin and legs.
Urine very dark, tea-colored or red-brown.
Later, jaundice: the white of the eye and the inside of the ears turn yellow, a sign that the liver is affected.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
By far the most common cause is administration by the owner themselves, with the best of intentions: a cat that is limping, has a fever or seems painful, and a human tablet given for lack of anything better.
Then come domestic accidents: a tablet dropped on the ground and swallowed, a sachet of effervescent powder left on a work surface, a glass of water containing a dissolved medication, a finger coated with syrup licked by the cat.
Some cold or flu specialties contain paracetamol without it being obvious on the box.
Human medications left accessible: nightstand, handbag, open pill bottle, work surface.
Habit of self-medicating household animals.
Cat visibly painful or feverish, which prompts you to act quickly without veterinary advice.
Visitors or elderly family members who carry their treatments, without knowing the danger for the cat.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
This is an immediate life-threatening emergency. Call a veterinarian immediately, day or night, even if the cat still appears normal: visible signs often appear when internal damage has already started.
Take the medication packaging with you, or take a photo of it: the exact name of the product and its presentation help the veterinarian act quickly.
Never try to make your cat vomit yourself. Do not give him milk, salt water, oil, or any other human medicine: these actions delay treatment and can worsen the situation.
At the clinic, the veterinarian evaluates oxygenation, examines the mucous membranes and takes a blood test to measure the damage to the red blood cells and the liver.
Treatment
Treatment is done at the veterinary hospital and is based on speed.
A specific antidote exists: it is only really effective if it is started early, before the liver is too damaged.
The cat receives an IV, oxygen if breathing is difficult, liver protectants and treatment for vomiting.
In severe cases, a blood transfusion may be necessary.
Monitoring lasts several days, with repeated blood tests to monitor the liver.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Never give human medicine to a cat for any reason. A cat in pain should be treated with a veterinary painkiller prescribed for it.
Store all medications in a closed cupboard, never on a bedside table or in a bag on the floor.
Immediately pick up a dropped tablet: a cat plays with it then licks its paws.
Warn visitors and other members of the household of this danger, which remains poorly known to the general public.
If in doubt about a treatment, a simple call to the veterinarian costs infinitely less than hospitalization.
Possible complications
Massive destruction of red blood cells, with severe anemia and lack of oxygen throughout the body.
Acute liver failure, sometimes permanent in animals that survive.
Kidney damage, as a continuation of blood and liver damage.
Death is common when treatment is delayed.
When to see a veterinarian
You have given paracetamol to your cat, even a small quantity: call a veterinarian immediately, without waiting for the slightest symptom.
You suspect that your cat has swallowed a tablet, licked a syrup or drank water from a glass containing medication.
Its gums are gray, bluish or brownish.
He breathes quickly or with difficulty when resting.
His face or paws swell.
His urine is dark brown or the white of his eye is yellowing.
Prognosis
The prognosis depends almost entirely on the time before treatment.
A cat brought in very quickly, before the signs appear or at the earliest, has a real chance of surviving with hospital treatment.
When the mucous membranes have already changed color or jaundice has set in, the prognosis becomes very guarded.
Frequently asked questions
A very small dose of paracetamol, is that really not possible?
No. There is no safe amount of paracetamol for cats. His body does not know how to eliminate this molecule: what is harmless for a human becomes toxic for him. No situation justifies giving it to him.
My cat is in pain, what can I give him while waiting for the vet?
Nothing. No human painkiller is suitable for cats, neither paracetamol, nor ibuprofen, nor aspirin. Place him in a quiet, warm place and call a veterinarian: there are effective and safe veterinary painkillers prescribed for him.
Should I make my cat vomit if I see him swallow a tablet?
No, never on your own initiative. Home methods are dangerous for cats and waste precious time. Call a veterinarian immediately and take away the product packaging.
My cat swallowed the tablet but he is fine: can I wait until tomorrow?
No. The first signs often appear several hours later, when the internal damage has already started. It is precisely during this symptom-free period that treatment is most effective.
References
AAFP — American Association of Feline Practitioners
Content reviewed by the TunisieVet editorial team · Updated 09 August 2026
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