Robenacoxib for Scorpion: Uses, Dosing & Side Effects

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Robenacoxib is a prescription NSAID sold under the brand name Onsior. It is a COX-2 selective anti-inflammatory medication used in veterinary medicine to reduce pain and inflammation, especially after surgery. In the United States, it is labeled for short-term use in cats and dogs, not for invertebrates such as scorpions.

That distinction matters. A scorpion's body systems, metabolism, and drug handling are completely different from those of mammals. There is no established veterinary evidence, approved label, or standard dosing guidance showing that robenacoxib is safe or effective in scorpions. If your scorpion seems injured, weak, or unable to move normally, your vet may need to focus on husbandry, hydration, trauma support, and species-specific care instead of mammal pain medications.

For pet parents, the safest takeaway is this: robenacoxib is a dog-and-cat medication, not a scorpion medication. Never try to estimate a dose at home for an exotic pet based on dog, cat, or human instructions.

In dogs and cats, robenacoxib is used to control pain and inflammation, most often around surgery. FDA and veterinary references describe use after procedures such as spay, neuter, and orthopedic surgery in cats, and short-term postoperative pain control in dogs. Some veterinary references also discuss use for musculoskeletal pain in small animals, depending on the country and clinical setting.

For a scorpion, though, there is no standard approved use. If a scorpion is lethargic, curled, not eating, dragging limbs, or reacting abnormally, the cause may be dehydration, molting problems, trauma, temperature issues, toxin exposure, or infection-like complications. Those problems are not solved by giving a mammalian NSAID.

If your scorpion appears painful or ill, see your vet with details about species, enclosure temperature, humidity, recent molts, feeding history, and any possible injury. That information is often more useful than trying a medication that has not been studied for arachnids.

There is no established or safe published dose for scorpions. Your vet should not rely on dog or cat dosing when treating an arachnid unless they are making a very specific exotic-animal judgment and have a clear medical reason. Because scorpions are so small and physiologically different, even tiny dosing errors could be serious.

For context only, labeled mammal dosing is very different by species. Merck lists robenacoxib at 1-2 mg/kg by mouth or injection every 24 hours in dogs and 1 mg/kg by mouth every 24 hours or 2 mg/kg by injection every 24 hours in cats. In the United States, FDA materials state that cats should receive robenacoxib for no more than 3 days, and more than three doses in cats have not been shown to be safe.

Tablets are meant to be given whole in the labeled species, and food may affect absorption. Because of that, splitting, crushing, or trying to dilute a tablet for a scorpion is especially risky. If your vet believes pain control is needed for your scorpion, ask whether supportive care, environmental correction, or a different exotic-appropriate plan makes more sense.

In dogs and cats, robenacoxib can cause side effects typical of NSAIDs. The most common concerns are vomiting, diarrhea, reduced appetite, lethargy, and stomach upset. More serious reactions can involve the kidneys, liver, or gastrointestinal tract, especially with overdose, dehydration, pre-existing disease, or use alongside other NSAIDs or steroids.

In a scorpion, side effects are not well described because the drug is not established for that species. That uncertainty is the problem. A scorpion that becomes weak, unresponsive, unable to right itself, drags limbs, stops drinking, or shows sudden posture changes after any medication should be treated as urgent.

See your vet immediately if your scorpion worsens after exposure to any medication. Bring the product name, strength, how much was given, and when it was given. With exotic pets, those details can make a major difference in the next steps.

Robenacoxib should not be combined with other NSAIDs or corticosteroids unless your vet specifically directs it. That includes medications such as carprofen, meloxicam, deracoxib, firocoxib, aspirin, prednisone, and dexamethasone. Combining these drugs can raise the risk of stomach ulceration, bleeding, kidney injury, and other complications.

VCA also notes possible interaction concerns with cyclosporine, furosemide, SSRIs such as fluoxetine, and tricyclic antidepressants such as amitriptyline or clomipramine. In dogs and cats, your vet may recommend baseline bloodwork and urinalysis before starting an NSAID, especially if longer treatment is being considered.

For scorpions, interaction data are essentially absent. That means even products that seem mild, including supplements or topical treatments used in the enclosure, should be discussed with your vet first. When evidence is limited, caution matters more, not less.