Pain & arthritis Dogs & Cats

Robenacoxib (Onsior) for dogs and cats

Controls pain and inflammation after surgery in dogs and cats. [1]

Last reviewed: October 2026 · 4 sources · see sources

Quick answerRobenacoxib is a prescription medicine for dogs and cats. A COX-2 selective NSAID that is used for short courses. The most common side effects: low appetite, tiredness, vomiting and diarrhea.

Key facts

Generic nameRobenacoxib
Common brand namesOnsior
Used inDogs & Cats
TypePain & arthritis
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Controls pain and inflammation after surgery in dogs and cats. [1]

How it works

A COX-2 selective NSAID that is used for short courses. [1]

Side effects and cautions

Common side effects: Low appetite, tiredness, vomiting and diarrhea. Kidney problems and bleeding at the incision site are possible. [1]

Use with care: Not for pets with stomach ulcers, pets that are pregnant or nursing, or pets under four months old. [1] [2] [3]

Call your vet right away if your pet has trouble breathing, facial swelling, hives, collapse, or any side effect that is severe or getting worse.

About dosingDosing is your vet's call. We don't list doses because the right amount depends on your pet's weight, age, health and other medicines. Don't change a dose or stop a medicine without asking your vet, and never give a pet medicine meant for people unless your vet tells you to [4].

What it costs

We don't list a price for this one because we couldn't find a reliable public source. Ask your vet or pharmacy for a quote; prices depend on your pet's size, the dose and where you fill it.

Robenacoxib FAQ

What is Robenacoxib used for in dogs and cats?

Controls pain and inflammation after surgery in dogs and cats.

What are the side effects of Robenacoxib?

Low appetite, tiredness, vomiting and diarrhea. Kidney problems and bleeding at the incision site are possible.

Does Robenacoxib need a prescription?

Yes. It needs a prescription from a veterinarian.

How much Robenacoxib should I give my pet?

Only your veterinarian can tell you. The right dose depends on your pet's weight, health and other medicines, so we don't list doses. Never give a pet a medicine prescribed for a person or another animal without asking your vet.

Related medications

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This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.

Sources (4) — tap to show
  1. VCA Animal Hospitals – Robenacoxib (veterinary drug handout)
  2. FDA – Get the facts about pain relievers for pets
  3. Merck Veterinary Manual – NSAIDs in animals
  4. FDA – Frequently asked questions about animal drugs