Onsior® (robenacoxib) for Cats

Get them back to being themselves. Onsior® is clinically proven to control postoperative pain and inflammation. See why it's the #1 prescribed feline NSAID.1

Why talk to your vet about Onsior®?

  • Large Cat and Two Tablets

    24-hour control of pain and inflammation with a single dose

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    Once-a-day dosing

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    Easy-to-give2 tablets that can be administered with or without food

How does it work?

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Postoperative pain and inflammation associated with orthopedic surgery, ovariohysterectomy (spay) and castration (neuter)

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Works for:

 Cats ages 4 months or older and 5.5 pounds or greater

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Treatment Planning – Schedule
Treatment frequency:

Once a day for a maximum of 3 days

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Requires prescription

Talk to your veterinarian about Onsior®

How to administer Onsior®


Follow your veterinarian's instructions for administering Onsior®.


Give your cat Onsior® only once a day, with or without food, for a maximum of three days. Give it at the same time each day.


Many cats require one tablet, but larger cats need two. Your veterinarian will tell you how much is right for your cat.

Onsior, Elanco and the diagonal bar logo are trademarks of Elanco or its affiliates.

ONSIOR Tablets for Cats is for the control of postoperative pain and inflammation associated with orthopedic surgery, ovariohysterectomy (spay) and castration (neuter) in cats greater than or equal to 5.5 pounds (2.5 kg) and greater than or equal to 4 months of age; for a maximum of 3 days.

Important Safety Information

ONSIOR tablets for cats should only be given to cats. People should not take ONSIOR tablets. Keep ONSIOR tablets and all medication out of reach of children. Do not use in cats less than 5.5 lbs. or less than 4 months of age. Do not give ONSIOR if your cat has had an allergic reaction (such as hives, facial swelling, or red or itchy skin) to robenacoxib (the active ingredient in ONSIOR) or to aspirin or other non-steroidal anti-inflammatory drugs (NSAIDs). Do not give Onsior with other NSAIDs (e.g., aspirin, meloxicam) or corticosteroids (e.g., prednisone). ONSIOR tablets should only be given once a day and for no longer than 3 days. ONSIOR tablets may cause some side effects in individual cats. These are normally mild, but serious side effects have been reported in cats taking NSAIDs including ONSIOR tablets. Serious side effects can result in death. It is important to stop the medication and contact your veterinarian immediately if your cat appears to be uncomfortable. Possible side effects are decreased appetite, vomiting, diarrhea, changed stool color, change in drinking or urination, behavioral changes such as depression or restlessness. For complete safety information, please see ONSIOR product label or ask your veterinarian.