Pain Medication in Cats

See your vet immediately if your cat has sudden severe pain, trouble breathing, collapse, crying out, a swollen belly, inability to urinate, or has eaten any human pain medicine. Cats process many drugs differently than people and dogs do, so medications that seem routine in a home medicine cabinet can be dangerous or fatal for them.

Pain medication in cats is not one single product. It is a broad group of prescription treatments your vet may use for short-term pain after surgery or injury, or for longer-term problems such as osteoarthritis, dental disease, nerve pain, or cancer-related discomfort. Common options include NSAIDs such as robenacoxib, opioids such as buprenorphine, gabapentin for chronic or neuropathic pain support, and frunevetmab injections for osteoarthritis pain.

Cats often hide pain well. A painful cat may sleep more, avoid jumping, resist being picked up, groom less, hide, become irritable, stop using stairs, or have a reduced appetite. Because these signs overlap with many illnesses, the right medication depends on the cause of pain, your cat’s age, kidney and liver health, hydration status, and any other medicines already being used.

The safest plan is individualized care. Your vet may recommend one medication or a multimodal approach that combines lower doses of several therapies. That can improve comfort while reducing side effects. Human pain relievers such as ibuprofen, naproxen, and acetaminophen should never be given unless your vet has given very specific instructions, because they can cause severe toxicity in cats.

Different pain medications work at different points in the pain pathway. NSAIDs such as robenacoxib reduce inflammation by blocking cyclooxygenase pathways involved in prostaglandin production. That makes them especially useful for inflammatory pain, including post-operative pain and some musculoskeletal pain. In the United States, FDA-approved feline NSAID use is limited: meloxicam is approved as a one-time injection before surgery, and robenacoxib is approved for up to three days for postoperative pain and inflammation.

Opioids such as buprenorphine work in the central nervous system to reduce pain signaling and are commonly used for acute pain, including after surgery, dental procedures, or trauma. Buprenorphine is popular in cats because it can be effective in very small doses and may be given by injection or, in some cases, absorbed through the cheek pouch depending on the product and your vet’s instructions.

Gabapentin works differently. It is often used as part of chronic pain management, especially when nerve sensitization or neuropathic pain is suspected, and it may also be included in multimodal plans for arthritis. It does not replace every other pain medication, but it can be helpful when paired thoughtfully with other treatments.

For cats with osteoarthritis, frunevetmab works in a targeted way. It is a monoclonal antibody that helps reduce pain associated with osteoarthritis and is given by injection about every 28 days. This option is not the right fit for every cat, but it gives your vet another non-NSAID choice for long-term arthritis pain management.

Side effects depend on the medication used. With NSAIDs, the biggest concerns are stomach upset, decreased appetite, vomiting, diarrhea, lethargy, and kidney injury, especially in cats that are dehydrated or already have kidney disease. Your vet may recommend bloodwork and monitoring before and during treatment. In the United States, repeated meloxicam use in cats carries a boxed warning because repeated use has been associated with acute kidney failure and death.

Opioids such as buprenorphine can cause sedation, dilated pupils, mild behavior changes, slowed activity, or less commonly agitation. Some cats seem very relaxed, while others may act restless or unusually affectionate. These effects can be normal, but if your cat seems hard to wake, has trouble breathing, or cannot stand, contact your vet right away.

Gabapentin commonly causes sleepiness and wobbliness, especially when first started or when the dose changes. That can be useful in some situations, but it can also make older cats less steady on stairs or furniture. If your cat has been on gabapentin regularly, do not stop it abruptly unless your vet tells you to. A taper may be needed.

No matter which medication is prescribed, call your vet promptly if you notice vomiting, black stools, refusal to eat, yellowing of the gums or eyes, marked sedation, stumbling, facial swelling, or any sudden change in breathing or urination. Those signs can point to a serious adverse reaction or to worsening disease rather than the medication alone.

Dosing for cats must be exact. Cats are small, and many pain medications have a narrow safety margin. Your vet will choose the drug, dose, and schedule based on your cat’s weight, diagnosis, hydration, kidney and liver values, and whether the goal is short-term or long-term pain control. Never guess a dose, split a human tablet without guidance, or use a dog prescription for a cat.

Examples from veterinary references show how different feline pain medications are used very differently. Merck lists robenacoxib at 1 mg/kg by mouth every 24 hours or 2 mg/kg by injection for up to three days, buprenorphine at 0.01 to 0.03 mg/kg every 4 to 8 hours depending on formulation and route, and gabapentin commonly at 3 to 10 mg/kg by mouth every 8 to 12 hours. These are reference ranges, not home instructions, and they do not replace your vet’s plan.

Administration matters too. Some buprenorphine products are injected in the hospital, while some formulations may be given into the cheek pouch at home if your vet prescribes that route. Robenacoxib is typically used short term. Frunevetmab is given as a veterinary injection about once monthly for osteoarthritis pain. If your cat spits out medication, drools, vomits after dosing, or becomes impossible to medicate, tell your vet. There may be another formulation or another tier of care that fits better.

If you miss a dose, do not double the next one unless your vet specifically tells you to. Keep all pain medications out of reach, and never use flavored human liquid products unless your vet has confirmed they are safe for cats. Some compounded or human formulations may contain ingredients that are not appropriate for pets.

Drug interactions are a major reason cats should only receive pain medication under veterinary guidance. NSAIDs should generally not be combined with corticosteroids such as prednisolone because that raises the risk of stomach ulceration and other complications. NSAIDs also require extra caution in cats taking other drugs that can affect the kidneys, hydration, or blood pressure.

Sedating medications can stack. Buprenorphine, gabapentin, anti-anxiety medications, some antihistamines, and certain anti-nausea or seizure drugs may all increase drowsiness when used together. That does not always mean the combination is wrong. In fact, multimodal pain control is common. It does mean your vet needs a full medication list, including supplements, CBD products, and anything borrowed from another pet.

Tell your vet if your cat has kidney disease, liver disease, heart disease, stomach ulcers, low appetite, vomiting, dehydration, or a history of reactions to pain medications. Those details can change which tier of care is safest. Monitoring may include an exam, bloodwork, urinalysis, or blood pressure checks before refills or dose changes.

The most important interaction warning is with human pain relievers. Ibuprofen, naproxen, and acetaminophen should not be given to cats unless your vet has given a very specific medical reason and exact instructions. If your cat may have eaten any human pain medicine, treat it as an emergency and contact your vet or a pet poison resource right away.