Onsior is an anti-inflammatory veterinary medicine for use in cats and dogs to treat pain and inflammation. In cats, Onsior tablets are used to treat pain and inflammation associated with acute (short term) and chronic (long term) musculoskeletal disorders (problems with the muscles and bones) and to reduce moderate pain and inflammation associated with orthopaedic (bone) surgery. The solution for injection is used to treat pain and inflammation associated with orthopaedic or soft tissue surgery, such as neutering.

In dogs, Onsior tablets are used to treat pain and inflammation associated with chronic osteoarthritis (a long-term disease causing pain and inflammation in the joints) and soft tissue surgery. The solution for injection is used to treat pain and inflammation associated with orthopaedic or soft tissue surgery.


Onsior for Dogs is a non-steriodal anti-inflammatory medication which helps to reduce fever, pain and inflammation. The active ingredient in Onsior is Robenacoxib. It is part of the coxib class of non-steriodal anti-inflammatory drugs (NSAID) which primarily helps with the treatment of pain and inflammation associated with osteo-arthritis in dogs.

Onsior is a prescription item and will be sent once a valid prescription is received. Please follow the instructions given by your vet. Onsior is supplied in individual 5mg, 10mg, 20mg and 40mg tablets or packs of 28. They are a round, beige tablet flavoured with artificial beef to make administration easier but most dogs will voluntarily take this medication.

Uses/benefits of Onsior For Dogs

Onsior is available as tablets in five different strengths (6 mg for cats and 5 mg, 10 mg, 20 mg, and 40 mg for dogs) and as a solution for injection (20 mg/ml for dogs and cats). The tablets are given once a day at the same time every day and the dose varies depending on bodyweight and use. Treatment in cats is limited to six days for acute musculoskeletal disorders and longer term for chronic musculoskeletal disorders, with monitoring by the veterinarian. Treatment in dogs for osteoarthritis should be for as long as is needed. If Onsior is used in cats and dogs to treat pain and inflammation associated with surgery, a single dose by mouth should be given before surgery. After surgery, a daily dose may be given for up to two further days.

The solution for injection is given as an injection under the skin to the animal around 30 minutes before the start of the operation at a dose based on the animal’s bodyweight. After surgery in cats and soft tissue surgery in dogs, once daily treatment may be continued at the same dosage and at the same time every day for up to 2 days.


Stop administration of ONSIOR if the dog experiences inappetence, vomiting or lethargy. The safe use of ONSIOR has not been evaluated in dogs younger than 4 months of age, dogs used for breeding, or in pregnant or lactating dogs. Dogs receiving ONSIOR should weigh at least 5.5 lbs. As a class, cyclo-oxygenase inhibitory NSAIDs may be associated with gastrointestinal, renal, and hepatic toxicity. Sensitivity to drug-associated adverse events varies with the individual patient. Dogs that have experienced adverse reactions from one NSAID may experience adverse reactions from another NSAID. Patients at greatest risk for adverse events are those that are dehydrated, on concomitant diuretic therapy, or those with existing renal, cardiovascular, and/or hepatic dysfunction. Anesthetic drugs may affect renal perfusion; approach concomitant use of anesthetics and NSAIDs cautiously. Appropriate monitoring procedures (including ECG, blood pressure, and temperature regulation) should be employed during all surgical procedures. The use of parenteral fluids during surgery is recommended to decrease potential renal complications when using NSAIDs perioperatively.

If additional pain medication is needed after a daily dose of ONSIOR, a non-NSAID/non- corticosteroid class of analgesic may be necessary. Concurrent administration of potentially nephrotoxic drugs should be carefully approached and monitored. NSAIDs may inhibit prostaglandins which maintain normal homeostatic function. Such anti-prostaglandin effects may result in clinically significant disease in patients with underlying or pre-existing disease that has not been previously diagnosed. NSAIDs possess the potential to produce gastrointestinal ulcerations and/or gastrointestinal perforations. Do not use ONSIOR concomitantly with other anti-inflammatory drugs, such as NSAIDs or corticosteroids. Consider appropriate washout times when switching from one NSAID to another or when switching from corticosteroid use to NSAID use.

Dosage and Administration

Carefully consider the potential benefits and risks of ONSIOR and other treatment options before deciding to use ONSIOR (robenacoxib). Use the lowest effective dose for the shortest duration consistent with individual response. For the control of pain and inflammation associated with osteoarthritis in dogs ≥ 2.5 kg AND ≥ 6 months of age, the recommended dosage of ONSIOR is 1 mg/kg body weight with a range 1 to 2 mg/kg. Administer orally once per day according to the dosing chart below. There is no maximal limit to duration of treatment.

Dosing Chart of ONSIOR (robenacoxib) Tablets for Dogs for Osteoarthritis

Body WeightNumber of Tablets by Strength
 5 mg10 mg20 mg40 mg
2.5 to less than 5 kg1 tablet   
5 to less than 10 kg 1 tablet  
10 to less than 20 kg  1 tablet 
20 to less than 40 kg   1 tablet
40 to less than 80 kg   2 tablets

Prices of Onsior For Dogs

$24.00 – $80.00

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