Firocoxib (Previcox) for Dogs: Uses, Dosage & Side Effects

See your vet immediately if your dog has vomiting, black or bloody stool, vomiting blood, collapse, yellowing of the eyes or gums, marked lethargy, or sudden changes in thirst or urination while taking firocoxib. These can be warning signs of serious NSAID side effects.

Firocoxib is a prescription nonsteroidal anti-inflammatory drug, or NSAID, made for dogs. It should only be used under your vet's guidance. The right plan depends on your dog's weight, age, hydration status, other medications, and whether there is any history of stomach, liver, kidney, or heart disease.

Never combine firocoxib with another NSAID, aspirin, or a steroid such as prednisone unless your vet specifically tells you to do so. Human pain relievers like ibuprofen, naproxen, and acetaminophen can be dangerous for dogs and should not be substituted.

If your dog accidentally gets extra tablets, call your vet, an emergency clinic, or a pet poison service right away. Fast action matters because stomach ulceration, kidney injury, and other complications can develop before obvious signs appear.

Firocoxib, sold under the brand name Previcox and some generic products, is a veterinary NSAID used to reduce pain and inflammation in dogs. It belongs to the coxib class and is considered COX-2 selective, which means it is designed to target inflammatory pathways more than the protective pathways involved in normal stomach and kidney function.

In practical terms, vets often use firocoxib when a dog is sore, stiff, limping, or recovering from surgery. It does not cure arthritis or repair an injury, but it can make movement more comfortable and improve day-to-day function.

Previcox comes as chewable tablets, most commonly 57 mg and 227 mg strengths. Even though the tablets are chewable, they are still a prescription medication and should be stored like any other drug. Many dogs will eat them readily, so keeping the bottle secured matters.

Because every NSAID carries some risk, your vet may recommend baseline bloodwork and follow-up monitoring, especially for senior dogs or dogs taking long-term treatment. That monitoring helps match the medication plan to your dog's health profile.

Firocoxib is FDA-approved in dogs for two main uses: controlling pain and inflammation associated with osteoarthritis, and controlling postoperative pain and inflammation associated with soft-tissue and orthopedic surgery. Those are the most common reasons your vet may prescribe it.

For arthritis, the goal is usually better comfort and mobility. Dogs may seem more willing to rise, use stairs, go for walks, or play. Improvement can be noticeable within days, but the full benefit depends on the dog's condition, body weight, muscle mass, and whether other supportive treatments are added.

After surgery, firocoxib is often part of a short-term pain-control plan. Your vet may use it before a procedure and continue it for a few days after, depending on the surgery and your dog's recovery.

Some dogs also need a broader pain-management plan. That may include weight support, rehab exercises, joint supplements, environmental changes, or other medications. Firocoxib is one option within that larger toolkit, not the only path.

The labeled dose of firocoxib for dogs is 5 mg/kg by mouth once every 24 hours. In pounds, that is about 2.27 mg per pound once daily. Your vet will calculate the actual tablet amount based on your dog's body weight and the tablet strength available.

For osteoarthritis, vets usually aim for the lowest effective plan and reassess over time. Some dogs need daily treatment, while others may have their plan adjusted based on comfort, lab results, and any side effects. For postoperative use, the medication is commonly given around the time of surgery and then continued short term as directed by your vet.

Firocoxib can be given with or without food, but giving it with a meal or small snack may help if your dog has mild stomach upset. Do not change the dose, split tablets differently, or use another dog's prescription without your vet's approval.

If you miss a dose, ask your vet how to proceed. In many cases, they will recommend giving it when remembered unless it is close to the next scheduled dose. Do not double up unless your vet specifically instructs you to. Also note that labeled tablets may not allow accurate dosing in very small dogs under about 12.5 pounds.

Many dogs tolerate firocoxib well, but side effects can happen with any NSAID. The more common problems are vomiting, diarrhea, reduced appetite, and lethargy. Mild digestive upset may improve when the medication is given with food, but ongoing signs still deserve a call to your vet.

More serious reactions can involve stomach ulceration, intestinal bleeding, kidney injury, liver injury, or neurologic changes. Warning signs include black or tarry stool, blood in vomit, yellowing of the eyes or gums, increased thirst, increased urination, weakness, wobbliness, agitation, or collapse.

Stop the medication and contact your vet right away if you notice any concerning change. Serious NSAID reactions can appear without much warning, and early action improves the chance of recovery.

Dogs at higher risk may include seniors, dehydrated dogs, dogs with pre-existing kidney, liver, heart, or gastrointestinal disease, and dogs taking interacting medications. That is why follow-up exams and lab monitoring are often part of a safe long-term plan.

The most important interaction is with other anti-inflammatory drugs. Firocoxib should not be combined with another NSAID, aspirin, or corticosteroids such as prednisone or dexamethasone unless your vet has a specific reason and a careful plan. Combining these drugs can sharply increase the risk of ulcers, bleeding, and kidney complications.

Your vet also needs to know if your dog takes ACE inhibitors, diuretics, certain blood pressure medications, anticoagulants, or other drugs that may affect kidney blood flow or bleeding risk. Supplements matter too. Fish oil, joint products, CBD products, and over-the-counter remedies may change the overall plan.

If your dog is switching from one NSAID to another, your vet may recommend a washout period. The exact timing depends on the previous medication, your dog's health status, and why the switch is being made.

Tell your vet about every medication, supplement, and recent treatment your dog has received. That includes flea and tick products, calming aids, and anything borrowed from another pet. A complete medication list is one of the best ways to prevent avoidable side effects.