Onsior (Robenacoxib) Dose for Cats & Dogs: Strengths & Dose Calculator
Onsior is robenacoxib from Elanco: 6 mg tablets for cats at 1 mg/kg once a day [1], and a 20 mg/mL injection for cats and dogs at 2 mg/kg under the skin once a day [2] — both for post-operative pain, for a maximum of 3 days [1][2].
- Contains
- Robenacoxib
- Company
- Elanco
- Forms
- Onsior 6 mg tablet for cats
Onsior injection 20 mg/mL - Label species
- Cats, Dogs
- Data from
- USA (FDA label)
- Type
- NSAID / pain relief
Onsior dose calculator
Results are calculated in your browser from the doses and strengths on this page. Check the strength printed on your pack and the label in your country before giving any dose.
Onsior strengths and presentations
| Presentation | Contains | Strength check |
|---|---|---|
| Onsior 6 mg tablet for cats PO | Robenacoxib 6 mg per tablet[1] | Confirmed |
| Onsior injection 20 mg/mL SC | Robenacoxib 20 mg per mL[2] | Confirmed |
| Body weight | Give |
|---|---|
| 2.5–6 kg | 1 whole tablet once daily |
| 6.1–12 kg | 2 × 2 whole tablets once daily |
Onsior dose by species
| Species | Use | Dose | Route | How often | Basis |
|---|---|---|---|---|---|
| Cats | Post-operative pain (tablets) Cats ≥ 2.5 kg and ≥ 4 months old. | 1 mg/kg[1] | PO | Once daily · Maximum 3 days | Label |
| Cats | Post-operative pain (injection) First dose about 30 minutes before surgery. | 2 mg/kg[2] | SC | Once daily · Maximum 3 days | Label |
| Dogs | Post-operative pain, soft-tissue surgery (injection) First dose about 45 minutes before surgery. | 2 mg/kg[2] | SC | Once daily · Maximum 3 days | Label |
Label directions
Warnings and precautions
About robenacoxib (the active ingredient)
Non-steroidal anti-inflammatory drug (NSAID, coxib — highly COX-2 selective).
How it works
NSAIDs reduce prostaglandin production by inhibiting the cyclooxygenase (COX) enzymes [3]. Robenacoxib is highly selective for COX-2 [3].
Key safety points
Pack sizes
Frequently asked questions
What is the Onsior dose for cats?
How many Onsior tablets for a 4 kg cat?
Cats of 2.5–6 kg get 1 whole 6 mg tablet once a day [1].
Can Onsior be used in dogs?
The US injection is labelled for dogs after soft-tissue surgery at 2 mg/kg SC once a day for up to 3 days [2].
Other brands of robenacoxib
More from Elanco
Onsior is a trademark of its owner. This page is an independent clinical reference and is not affiliated with Elanco. Strengths, species and withdrawal periods can differ between countries — always follow the pack insert in your country.
References
- ONSIOR (robenacoxib) 6 mg tablets for cats — FDA labeling
Passage read from this source
ONSIOR tablets are available as 6mg round favored tablets in blisters
The dose of ONSIOR tablets is 0.45mg/lb (1mg/kg) orally once daily, for a maximum of 3 days.
Do not use in cats weighing less than 5.5 lbs, as cats less than 5.5 lbs cannot be accurately dosed.
ONSIOR has been shown to prolong the QT interval.
- ONSIOR (robenacoxib) injection — FDA labeling
Passage read from this source
ONSIOR (robenacoxib) injection is available as a 20 mg/mL solution in a 20 mL multidose vial.
0.91 mg/lb (2 mg/kg) subcutaneously once daily, for a maximum of 3 days
The first dose should be administered approximately 30 minutes prior to surgery
The first dose should be administered approximately 45 minutes prior to surgery
- Nonsteroidal Anti-inflammatory Drugs in Animals
Passage read from this source
Robenacoxib is a coxib-class highly selective COX-2 inhibitor
Dosage is 2 mg/kg, PO, initially and then 1–2 mg/kg per day thereafter (for up to 6 days in cats).
NSAIDs act primarily to reduce the biosynthesis of prostaglandins by inhibiting cyclooxygenase (COX).
For veterinary professionals. Information supports — never replaces — clinical judgement; always check the current product label and local regulations.