고양이 소염진통제(NSAID) 안전한 사용 총정리 — 보호자가 알아야 할 핵심

Complete Guide to the Safe Use of NSAIDs in Cats — Key Points for Pet Owners

JointQ&AMeongsiljang Veterinary Advisory Board

Cats have a very limited ability to metabolize NSAIDs, so giving them these medications without veterinary guidance can lead to kidney and gastrointestinal damage. We’ve outlined the proper use of veterinarian-prescribed medications and a list of drugs that are strictly prohibited for cats.

What Are Feline NSAIDs?

A cat resting comfortably in the examination room of an animal hospital.

Feline nonsteroidal anti-inflammatory drugs (NSAIDs) are a class of medications that reduce inflammation and alleviate pain, commonly used to treat arthritis, post-surgical pain, and recovery from injuries. What’s truly important to understand is that, unlike dogs, cats have a significantly reduced ability to metabolize NSAIDs due to a deficiency in hepatic glucuronidation enzymes. This means even the same medication can cause toxicity much more quickly in cats. If pet owners administer human or dog pain relievers without veterinary guidance, it can lead to kidney, gastrointestinal, and liver damage.

Why Are Cats More Vulnerable to NSAIDs?

Cats have significantly lower glucuronidation enzyme activity in the liver compared to other animals. This deficiency causes NSAIDs to remain in the body for extended periods, damaging the gastric mucosa, reducing renal blood flow, and potentially causing severe hepatotoxicity. Even small amounts of human NSAIDs like ibuprofen and naproxen are dangerous for cats. Aspirin also poses a risk, as its slow metabolism in cats can lead to toxic accumulation.

Safety Overview of NSAIDs for Cats at a Glance

Item	Meloxicam	Carprofen	Ibuprofen	Aspirin
Whether it can be used in cats	Short-term use possible with veterinary prescription	Single-dose use only under veterinary judgment (repeated use not recommended)	❌ Absolutely prohibited	❌ Prohibited in principle (only exceptions under veterinary management, e.g., antithrombotic purposes)
Major risks	Acute kidney failure and death with repeated/long-term use (black box warning)	Gastrointestinal and kidney damage with repeated use	Acute kidney failure, gastrointestinal ulcer/bleeding, death	Toxic accumulation and gastrointestinal bleeding due to slow metabolism
Risk level at small doses	Low (within an appropriate prescribed dose)	Moderate	Very high	High

No pain reliever should be given to a cat without a veterinarian's prescription.

How to Properly Use Veterinarian-Prescribed NSAIDs

If your pet has been prescribed meloxicam or robenacoxib, it is essential to strictly follow the lowest effective dose and duration determined by your veterinarian. Before starting treatment, it is advisable to conduct a physical examination and check baseline values such as blood pressure, liver enzymes, kidney function, and blood protein levels. After beginning treatment, monitor for any adverse signs with a follow-up at 5–7 days (which may be done via phone consultation), followed by a physical examination and blood and urine tests at 2–4 weeks. For long-term use, ensure you keep all scheduled recheck appointments. If your pet stops eating or develops vomiting or diarrhea, stop the medication immediately and contact your clinic. Do not continue administering the medication beyond the prescribed treatment period.

A veterinarian accurately measuring a cat's medication dosage with a syringe.

List of Medications That Should Never Be Given to Cats

Even small amounts of ibuprofen (such as Advil), naproxen, or aspirin can cause kidney failure, gastrointestinal bleeding, and death in cats. Carprofen, which is formulated for dogs, should also never be given to cats. Under no circumstances should you give your cat leftover human medications or pain relievers obtained without veterinary guidance.

NSAID Side Effects — Don’t Miss These Signs

Vomiting and diarrhea: These are often the first signs of stomach lining irritation. If they persist for more than a day after starting medication, seek veterinary care immediately.

Loss of appetite: As toxins build up, your pet may refuse food. Not eating for over a day is a warning sign.

Changes in water intake: Kidney damage can cause sudden increases or complete lack of thirst.

Lethargy and weakness: As toxicity progresses, your pet’s activity level will drop significantly.

Changes in urine output: Excessive or reduced urination may indicate kidney dysfunction.

A cat lying down listlessly — a symptom of NSAID side effects

Seek Emergency Veterinary Care Immediately for These Symptoms

Seek emergency veterinary care immediately if you notice blood in your pet’s vomit or diarrhea, if they refuse to eat for more than 12 hours, if they stop urinating entirely, or if they suddenly collapse or have seizures. It is highly beneficial for treatment to bring a written record of the medication’s name, dosage, and the time it was administered.

Home Monitoring During Medication

During the medication period, keep a simple daily log of your cat’s food and water intake, as well as urine and stool patterns, so you can quickly spot any warning signs. If your cat is eating well and maintaining normal activity levels, you can rest assured. It’s important not to miss any blood test appointments scheduled by your veterinarian. If the goal is managing arthritis, also consider weight control and environmental improvements like non-slip mats.

A pet owner who carefully observes how their cat drinks water

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can I give Tylenol (acetaminophen) to my cat?

Absolutely not. Although Tylenol is not an NSAID, it is an extremely dangerous fever reducer and pain reliever for cats. Cats have very little of the enzyme needed to break down acetaminophen, so even a small amount can destroy red blood cells and cause fatal liver damage.

How long can I safely give my pet meloxicam as prescribed by the vet?

Use this medication only for the duration prescribed by your veterinarian. It may be used short-term (a few days to one week) after surgery, or in cases of chronic arthritis, it should be administered at the lowest effective dose while monitoring with regular blood tests. Extending the treatment period without veterinary guidance significantly increases the risk of kidney damage.

Are there any alternatives to painkillers for cats with arthritis?

Yes. Maintaining an ideal body weight, using low-entry litter boxes and non-slip mats, applying heat pads, and administering glucosamine and omega-3 supplements under veterinary guidance can all be helpful. In severe cases, physical therapy or laser therapy may also be recommended.

My cat accidentally ingested a human painkiller. What should I do?

Contact your veterinarian immediately or take your pet to an emergency animal hospital. Be prepared to provide details about the medication, including its name, the amount ingested, and the time of ingestion. Do not attempt to induce vomiting at home; the best course of action is to get to the clinic as quickly as possible.

What’s the first thing a cat owner should do to support their cat’s joint health?

This is a routine health checkup. Cats are skilled at hiding pain, so signs of arthritis are often detected late. Annual checkups are recommended, or every six months for cats aged seven and older, to enable early detection and treatment.

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References

[1] Means C, et al. Blackwell's Five-Minute Veterinary Consult Clinical Companion: Small Animal Toxicology, 3rd Edition. Wiley-Blackwell, 2019.

[2] Enberg TB, Braun LD, Kuzme AB. Gastrointestinal perforation in five dogs associated with the administration of meloxicam. J Vet Emerg Crit Care. 2006;16(1):34–43.

[3] Lascelles BD, Blikslager AT, Fox SM, Reece D. Gastrointestinal tract perforation in dogs treated with a selective cyclooxygenase-2 inhibitor: 29 cases (2002–2003). J Am Vet Med Assoc. 2005.

[4] Papich MG. Handbook of Veterinary Pharmacology, 2nd Edition. Saunders/Elsevier, 2011.

[5] Schaer M. Clinical Medicine of the Dog and Cat, 4th Edition. CRC Press, 2022.