Onsior Recall

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Questions & Answers

Side Effects & Adverse Reactions

Not for use in humans. Keep this and all medications out of reach of children. Consult a physician in case of accidental ingestion by humans. For use in cats only.

All cats should undergo a thorough history and physical examination before the initiation of NSAID therapy. Appropriate laboratory tests should be conducted to establish hematological and serum biochemical baseline data prior to administration of an NSAID.

Owners should be advised to observe for signs of potential drug toxicity (see Adverse Reactions and Animal Safety) and be given an “Information for Cat Owners” Sheet about ONSIOR tablets.

Do not administer ONSIOR tablets in conjunction with any other oral or injectable NSAID or corticosteroid.

Legal Issues

There is currently no legal information available for this drug.

FDA Safety Alerts

There are currently no FDA safety alerts available for this drug.

Manufacturer Warnings

There is currently no manufacturer warning information available for this drug.

FDA Labeling Changes

There are currently no FDA labeling changes available for this drug.


ONSIOR tablets are indicated for the control of postoperative pain and inflammation associated with orthopedic surgery, ovariohysterectomy and castration, in cats > 5.5 lbs (2.5 kg) and > 4 months of age; for up to a maximum of 3 days.


There is currently no drug history available for this drug.

Other Information

ONSIOR (robenacoxib) is a non-narcotic, non-steroidal anti-inflammatory drug (NSAID) of the coxib class. Tablets are round, beige to brown in color, not scored, flavored and contain 6 mg robenacoxib. The molecular weight of robenacoxib is 327.28.  The empirical formula is C16-H13-F4-NO2.  Robenacoxib is [5-Ethyl-2-(2,3,5,6-tetrafluoro-phenylamino)-phenyl]-acetic acid. The structural formula is:

robenacoxib structural formula

Onsior Manufacturers

  • Novartis Animal Health Us, Inc.
    Onsior (Robenacoxib) Tablet [Novartis Animal Health Us, Inc.]
  • Novartis Animal Health Us, Inc.
    Onsior (Robenacoxib) (Robenacoxib) Injection, Solution [Novartis Animal Health Us, Inc.]

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