When to see a vet urgently
Contact a vet immediately even for possible ibuprofen exposure. Particular emergency signs include:
- vomiting blood or black, tar-like stools;
- severe weakness, unsteadiness or reduced consciousness;
- seizures or tremors;
- a marked reduction or complete stop in urination.
An absence of symptoms is not a reason to wait. You can find a vet near you.
Overview
Ibuprofen is widely used in human medicine to relieve pain and fever, but cats do not metabolise it efficiently. It circulates in the body for a long time and has toxic effects on the digestive tract and kidneys. Poisoning can follow eating tablets or capsules, or misguided home treatment when an owner gives a human medicine to a cat.
Ibuprofen inhibits production of chemical messengers called prostaglandins. These also help protect the digestive tract and maintain kidney blood flow. Reduced activity explains why a pain-relieving substance can damage these organs at the same time. Its effects therefore extend beyond temporary stomach irritation.
The kidneys are particularly vulnerable if their blood supply is already reduced. The vet considers dehydration and previous illnesses, for example. An amount suitable for a person cannot be made safe for a cat by reducing a tablet according to your own judgement. Cats' ability to process many NSAIDs differs from that of people and dogs.
As well as reducing protective mechanisms, NSAIDs can damage the digestive tract through direct irritation. A settled stomach or offering food therefore does not remove the other risks of medicine already absorbed.
Causes
The main ways ibuprofen poisoning occurs in cats are:
- tablets accidentally left within reach;
- an owner's mistake in giving a human medicine to a cat;
- incorrect medicine storage;
- use of combination products, such as cold remedies, containing ibuprofen.
Exposure does not always involve a whole tablet. Human topical products may also contain an NSAID. A cat may lick medicine from skin or groom a product transferred to their coat. Chewing a tube or packaging can also cause exposure. Storage therefore needs to cover every formulation, rather than just tablet bottles.
A combination product may contain other active ingredients as well as ibuprofen. The precise product name and ingredient list are therefore more useful to the vet than simply knowing it was a painkiller or cold remedy. Another ingredient's possible effects can change the investigations and treatment needed.
Risk factors
Cats are more vulnerable to poisoning:
- when they have unrestricted access to medicine cupboards or tablets;
- in homes with children, where medicines may be left unattended;
- when owners attempt home treatment;
- at an older age or with chronic kidney or gastrointestinal disease.
The opportunity for exposure and the body's susceptibility are separate matters. The list does not mean cats in other households are safe or that a young, healthy cat can tolerate ibuprofen. Feline-specific information on risk differences related to family circumstances is limited. Assessment is based primarily on the possible product, amount received, timing and the cat's health.
Other medicines also affect the assessment. Another NSAID or a corticosteroid given at the same time can particularly increase gastrointestinal risks. Report every medicine given to your cat, including previously prescribed veterinary pain relief. Do not give an extra medicine while waiting for instructions.
Symptoms
Signs depend on the amount ingested and the time since exposure:
- vomiting, often containing blood;
- diarrhoea and black, tar-like stools;
- abdominal pain and loss of appetite;
- tiredness and listlessness;
- increased thirst and urination in early kidney damage;
- seizures and coma in severe poisoning.
Signs may be delayed and change over time. Stomach symptoms therefore do not show the full severity, and normal behaviour early on does not rule out later organ damage. If you notice a missing tablet before symptoms appear, contact the practice at that point.
Kidney dysfunction does not always show only as increased drinking and urination. Less urine than usual, or none at all, may be produced. Severe exposure can also cause liver damage or neurological signs. The absence of one symptom does not establish that other injuries will not develop.
Complications and consequences
Ibuprofen poisoning can lead to:
- gastrointestinal ulcers and bleeding;
- severe anaemia resulting from blood loss;
- acute kidney failure;
- neurological complications;
- death without prompt treatment.
A gastrointestinal ulcer can cause significant bleeding and, in a severe case, perforation of the wall. This requires more than relief of vomiting. Kidney or liver damage may sometimes remain permanent even if the acute situation is controlled.
The prognosis depends on factors including the amount of exposure, how quickly treatment begins and damage already sustained. A cat treated early may recover well, but severe kidney injury carries a poorer prognosis. Visible vomiting stopping does not alone show that danger has passed.
Diagnosis at the vet
Diagnosis is based on:
- the history, including access to tablets;
- blood tests for acidosis, electrolyte disturbances and anaemia;
- blood biochemistry showing raised creatinine and urea;
- urine analysis for reduced concentration, blood and protein;
- endoscopy if ulcers are suspected.
What should you bring to the appointment?
Bring the medicine packaging or be ready to provide its name, strength and active ingredients. Estimate how many tablets or how much product may be missing, when exposure could have happened and whether your cat received it previously. If the amount is unknown, say so directly: uncertainty is included in the risk assessment.
A blood count assesses problems such as anaemia from bleeding, while biochemistry monitors organ function. Urine tests complement kidney assessment. Tests may need repeating because one early result does not describe every effect that may develop later. The need for endoscopy or another investigation is decided according to findings.
First aid for suspected exposure
Prevent further exposure and contact a vet while arranging transport. Do not try to make your cat vomit at home. Do not start activated charcoal or another oral home treatment yourself either. The practice assesses whether removing the substance from the digestive tract is still useful and safe.
Keep your cat supervised in a quiet place where they can be collected for transport. A cat having seizures or with altered consciousness is not handled like an animal taking routine medication. Mention these symptoms immediately on the phone so the practice can prepare. Looking for exact information must not delay making contact.
Treatment and follow-up
Early on, the vet may consider inducing vomiting or giving activated charcoal. These require professional assessment and are not automatic solutions in every poisoning. Time since exposure and your cat's condition affect the choice. Treatment is still needed later even if absorption can no longer be reduced effectively.
In hospital, gastrointestinal protective medication and fluid therapy may be given, with monitoring of kidney function and urine output. A cat having seizures or significant blood loss may need intensive care or a blood transfusion. Care is determined by the damage found and how it develops.
For severe poisoning, specialist care may also consider blood treatment outside the body. Plasma exchange replaces the liquid part of blood, while haemoperfusion passes blood through a filter that binds substances. These may aim to reduce medicine circulating in the blood. Suitability is assessed separately; mentioning them does not mean they are needed for every exposed cat or guarantee recovery.
Medication and follow-up blood tests are agreed at discharge. Report failure to eat, renewed vomiting, black stools or changes in drinking and urination. Some patients need prolonged ongoing care. Treatment is not stopped simply because your cat looks brighter.
Prevention
Ibuprofen poisoning is entirely preventable:
- never give cats medicines intended for people;
- store medicines out of cats' reach;
- tell the whole family about the dangers of human medicines to pets;
- use only veterinary-prescribed products for pain relief.
Keep animal medicines in their own packaging, separate from human medicines and out of children's reach too. Check immediately for a dropped tablet, and keep handbags and temporarily used packaging somewhere your cat cannot access. Explain storage instructions to everyone using medicines in the home.
A vet can prescribe suitable pain relief for a cat, but ibuprofen does not become appropriate because another NSAID was prescribed previously. Do not assume that a product given to a dog is suitable either. A safe medicine and method of use are chosen separately for each animal.
What it means for owners
Ibuprofen is one of the most common and dangerous causes of poisoning in domestic cats. Owners should remember that even one tablet can be fatal. If there is the slightest suspicion of ingestion, take your cat to a vet immediately: time is critical in saving your pet.
Tablet strength, your cat's size and the possible amount received affect risk assessment. Safety is not inferred simply from the number of tablets; exposure is assessed immediately by a vet.
Note: this material provides general information and does not replace veterinary advice. If symptoms develop, contact a vet immediately.
Frequently asked questions
Is care needed even if my cat seems normal?
Yes. Even possible ibuprofen exposure requires immediate contact. Symptoms may be delayed, and early treatment can reduce the risk of serious damage. Do not wait for vomiting blood or changes in urination.
Can I make my cat vomit at home?
No. A vet assesses whether inducing vomiting is needed and safe. Do not induce vomiting yourself or start activated charcoal or another home treatment without the practice's instructions.
Can poisoning result from medicine applied to skin?
Yes, if your cat licks an ibuprofen product from skin, fur or packaging. Tell your vet about this possibility even if no tablets are missing.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Ibuprofen Poisoning in Cats, VCA Animal Hospitals, accessed 2026-11-02.
- Toxicoses From Human Analgesics in Animals, Merck Veterinary Manual, accessed 2026-11-02.
- Get the Facts about Pain Relievers for Pets, U.S. Food and Drug Administration, accessed 2026-11-02.
- Ibuprofen poisoning in dogs and cats, PDSA, accessed 2026-11-02.
- Poisons, Cornell University College of Veterinary Medicine, accessed 2026-11-02.
- Common Over-the-Counter Toxins in Cats, VCA Animal Hospitals, accessed 2026-11-02.