Onsior
COX-2-selective NSAID used for short-term pain and inflammation from soft-tissue surgery and orthopaedic procedures, and longer-term for osteoarthritis in dogs over six months old. Active ingredient: robenacoxib.
See your saving over a year
Pick your dog's weight (and optionally your vet's actual quote) to see the exact monthly and annual saving. The price comparison table below sorts pharmacies by cheapest first; we never sort by commission.
Based on a 15 kg dog, recommended strength: 5 mg. Assumes 12 months of continuous use (chronic dosing) and one written prescription per year. CMA Order caps the prescription fee at £21 for the first medicine, plus £12.50 per additional medicine on the same prescription. Prices are indicative and last verified 2026-05-15. Always confirm the current price on the pharmacy site before purchase.
Why it costs more at the vet
Onsior is a branded Elanco product and one of the most-prescribed NSAIDs in UK first-opinion practices. Vet mark-ups on branded NSAIDs are typically 100-200% above wholesale.
Common side effects
- Vomiting
- Soft stools
- Reduced appetite
Not a complete list. Always read the patient information leaflet and speak to your vet about side effects.
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How to get a written prescription
The CMA Order is legally binding by 23 September 2026. Every UK vet must offer a written prescription on request, with the fee capped at £21 for the first medicine plus £12.5 per additional medicine on the same prescription. Take the prescription to any VMD-approved online pharmacy listed above.
Common questions
- Is Onsior safer for the stomach than Metacam?
- Both are COX-2-selective NSAIDs. Onsior is shorter-acting and is sometimes preferred for short-term use after surgery. Your vet decides which suits a given dog.
- Can I switch from Onsior to a generic NSAID?
- Only on your vet's instruction. They can prescribe whichever NSAID is most suitable and you can fill the written prescription at any VMD-approved online pharmacy.
Similar medications
Track Onsior price drops
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Same medicine, same regulator, same vet relationship — half the price. Five-minute switch from in-clinic dispensing to a VMD-approved online pharmacy.
Pricing data status: indicative. Last verified 2026-05-15. Pharmacies change prices regularly — always confirm before purchase. Not medical advice.