Robenacoxib (Onsior) for Dogs

Robenacoxib (brand name: Onsior) is a prescription NSAID pain reliever for dogs. It’s a COX‑2–selective anti‑inflammatory that helps reduce pain and swelling. Front‑office snapshot: It’s most commonly prescribed for short‑term control of pain and inflammation around soft‑tissue surgeries in dogs (for example, spay/neuter, lump removal, or dental procedures). This medication is Rx‑only. Your veterinarian can explain the plan for your dog and discuss benefits, risks, and what to watch for.

Onsior (robenacoxib) is a prescription NSAID for dogs used short term to control pain and inflammation after soft‑tissue surgery. It should not be combined with another anti‑inflammatory (for example, carprofen, aspirin) or a steroid (for example, prednisone) unless the veterinarian specifically directs this. Most dogs receive it only briefly (up to three days); your veterinarian will advise how long your dog should take it. Top owner FAQs (quick answers): What side effects should I watch for? Mild stomach upset can occur; call us the same day if your dog won’t eat, vomits, or has diarrhea. Seek emergency care now for black/tarry stool, blood in vomit or stool, repeated vomiting, severe lethargy, collapse, yellow gums/skin, or sudden big changes in drinking or urination. What if I missed a dose or my dog spit it out? Don’t give an extra dose—call us so our veterinarian can advise on next steps. Can I give it with food or other meds? The label allows with or without food, but some medicines are unsafe together; do not give with any other anti‑inflammatory or a steroid unless our veterinarian says it’s okay. My dog has kidney, liver, or stomach issues—can they take Onsior? Your veterinarian will review your dog’s history and current medications to decide; in some dogs with kidney, liver, stomach/ulcer, or bleeding problems, an alternative may be safer.

Owners most often report mild stomach upset with robenacoxib (Onsior) in dogs—one‑time vomiting, soft stool/diarrhea, eating less than usual, or acting a bit tired. These effects are known with NSAIDs and are usually short‑lived, but owners should monitor closely and keep us informed so a veterinarian can advise next steps. Your veterinarian can discuss expected post‑op recovery and what to watch for based on your dog’s health history. Red flags that need same‑day follow‑up include repeated vomiting or diarrhea, blood in vomit or stool, black/tarry stools, refusing food for a day or more, marked lethargy, belly pain, sudden behavior changes, wobbliness/ataxia, seizures, or yellow eyes/gums (possible jaundice). Drinking or urinating much more than usual, or unexpected bleeding or bruising around an incision, also warrant prompt veterinary review. If there is collapse, nonstop vomiting, very pale gums, trouble breathing, or large amounts of blood, treat this as an emergency and direct the owner to the nearest emergency clinic immediately.

Forms: At home, dogs typically receive robenacoxib as oral tablets. Give tablets whole—do not split, crush, or chew. If a dog won’t take a pill, try hiding it in a small bite of food or a pill pocket and offer a follow‑up “chaser” treat. Keep the blister pack out of reach; many dogs find these tablets palatable. Food and giving tips: This medication can be given with or without food. If the dog vomits when given on an empty stomach, future doses can be given with a small meal. If vomiting happens right after a dose and you see the tablet, ask the veterinarian for next steps before giving any more. Troubleshooting and when to escalate: If repeated vomiting, loss of appetite, black/tarry stool, blood in vomit or stool, marked lethargy, or changes in drinking/urination occur, this could be serious—advise immediate veterinary care. If pilling remains difficult, your veterinarian can discuss whether a compounded formulation is appropriate for that patient.

Onsior (robenacoxib) for dogs is an Rx-only NSAID labeled for short-term use after soft‑tissue surgery; U.S. FDA materials list robenacoxib for dogs with a maximum labeled duration of 3 days. Because of this label limit, refills are uncommon and must be reviewed by the veterinarian before any approval. NSAIDs can affect the stomach/intestines, liver, and kidneys; the label and FDA guidance emphasize giving owners the client information sheet and monitoring for side effects. Your veterinarian will decide if a re‑examination, blood/urine tests, or an alternative plan is needed before any additional supply is authorized. Refill call workflow (suggested): collect pet and owner identifiers; medication name and form (tablet vs past injection), the surgery date, prescribing doctor, how many doses remain, other current meds, and any side effects (vomiting/diarrhea, black/tarry stools, not eating, yellow gums/eyes, severe lethargy). Standard turnaround for non-urgent refill requests is 1–2 business days; mark same‑day for review if the request would extend use beyond 3 days post‑op or if side effects are reported. For online pharmacies, prescriptions must be sent to a state‑licensed pharmacy that requires veterinarian authorization; be alert to sites that do not require a prescription or advertise unusually low prices—route these to the veterinarian/pharmacy team for guidance. Escalate immediately to a veterinarian if the caller reports black/tarry stools, vomiting with blood, yellowing of gums/eyes, refusal to eat, severe lethargy, collapse, or breathing trouble. Advise the caller that the veterinarian can discuss risks, monitoring, and whether any further pain control is appropriate.

Emergency red flags while a dog is taking robenacoxib (Onsior) include: trouble breathing, sudden facial swelling or hives, collapse; vomiting blood or material that looks like coffee grounds; black/tarry stool; nonstop vomiting or diarrhea; refusal to eat; extreme lethargy or weakness; seizures or stumbling; very pale or yellow gums/eyes; or a sudden big increase in drinking or urination. Treat these as an emergency—alert a veterinarian or technician immediately and prepare for immediate in‑person evaluation. These signs are listed in NSAID safety guidance and Onsior’s product labeling, and severe reactions can occur without warning. Your veterinarian can discuss individual risks and what to watch for based on the dog’s history. If an overdose is suspected (chewed into the pack, extra doses, or unknown amount), this is an emergency. Possible toxicity signs include vomiting or diarrhea (with or without blood), dark/black stool, loss of appetite, lethargy, increased thirst or urination, bloody urine, incoordination, or seizures—get the veterinary team right away and have the owner bring the medication packaging. Also escalate urgently if the dog received another pain medication (another NSAID) or a steroid the same day, or if there’s a history of kidney, liver, or stomach/intestinal disease along with any of the signs above. Your veterinarian can advise on safe medication combinations and next steps.

Onsior (robenacoxib) is an NSAID. Flag and hand off to a veterinarian if an owner mentions: another NSAID (carprofen, deracoxib, firocoxib, meloxicam, aspirin) or a corticosteroid (prednisone, prednisolone, dexamethasone). These combinations raise the risk of stomach/intestinal ulceration or bleeding and kidney/liver injury. Veterinary-labeled guidance also notes caution with highly protein‑bound medications and that compatibility should be monitored when other drugs are needed; your veterinarian can advise on safe combinations and any needed washout periods. ([drugs.com](https://www.drugs.com/vet/onsior-tablets-for-dogs.html)) Also flag common co‑meds that may require veterinarian review: diuretics (furosemide) and ACE inhibitors (enalapril, benazepril) because NSAIDs can reduce kidney blood flow and blunt blood‑pressure control; immunosuppressants such as cyclosporine (kidney risk); and behavior meds that affect platelets (SSRIs like fluoxetine; TCAs like clomipramine) which may increase bleeding risk with NSAIDs. If owners mention giving human OTC products, flag immediately: ibuprofen (Advil/Motrin), naproxen (Aleve), aspirin, or bismuth subsalicylate (Pepto‑Bismol). These can cause serious GI bleeding and/or kidney injury in dogs, and should only be used if a veterinarian has explicitly approved. Urgent escalation if the pet has vomiting, black/tarry or bloody stool, not eating, marked lethargy, yellow gums/eyes, or sudden changes in drinking/urination—these require same‑day veterinary assessment or emergency care. Your veterinarian can discuss safer alternatives and timing. ([merckvetmanual.com](https://www.merckvetmanual.com/pharmacology/systemic-pharmacotherapeutics-of-the-cardiovascular-system/angiotensin-converting-enzyme-inhibitors-for-use-in-animals))

Storage: Keep Onsior (robenacoxib) tablets at controlled room temperature 59–77°F (15–25°C). Tablets are supplied in perforated blister cards; when dispensing, include the manufacturer’s Onsior dispensing envelope with the Information for Dog Owners insert. Tablets are not scored—do not split or crush. Always store in a secure place out of reach of children and all pets, as flavored tablets may be attractive. Shelf life after opening: The U.S. label for Onsior tablets for dogs does not list a specific “use X days after opening” timeframe for blistered tablets. Follow the printed expiration date on the package and keep product in its original packaging. If a blister is damaged or tablets are repackaged/compounded, your veterinarian or dispensing pharmacist can advise on an appropriate beyond‑use date. Disposal: Prefer a drug take‑back program (permanent drop box, mail‑back, or community take‑back). If no take‑back is available and the medicine is NOT on FDA’s flush list, mix tablets with an unappealing substance (e.g., used coffee grounds or cat litter), seal in a container, and place in household trash; do not flush. If a child or another pet swallows the medication—or the dog receives more than prescribed—seek emergency care or contact poison control immediately. Your veterinarian can discuss clinic take‑back options and safe storage while traveling.

Onsior (robenacoxib) for dogs is an Rx NSAID labeled in the U.S. for short-term control of pain and inflammation after soft‑tissue surgery, for a maximum of 3 days. The first dose is typically given at the hospital on surgery day. Schedule the surgeon’s standard post‑op recheck as directed in the discharge instructions (often within the first 1–2 weeks). A next‑day phone check is helpful to confirm comfort and screen for side effects. Per the product label, dogs should have a history/physical and appropriate baseline lab work (CBC/chemistry) before NSAID therapy—this is usually covered by the pre‑anesthetic workup. Routine additional bloodwork is not typically required for this short course unless the veterinarian requests it or the pet has specific risk factors. Your veterinarian can discuss if any extra labs or earlier rechecks are needed for individual cases. At home, owners should monitor for vomiting, diarrhea, loss of appetite, black/tarry or bloody stools, increased thirst/urination, yellow gums/eyes, lethargy, incoordination, seizures, or unusual behavior, and they should avoid giving any other anti‑inflammatory or steroid medications unless the veterinarian approves. If concerning signs occur, advise the owner to contact the clinic immediately for guidance from the veterinarian; collapse, seizures, or black/tarry stools warrant immediate emergency care. Ensure owners receive the NSAID “Information for Dog Owners” handout with any take‑home doses.

Onsior (robenacoxib) is a prescription COX‑2 selective NSAID for dogs. In the U.S., it is labeled to control pain and inflammation after soft‑tissue surgery for a very short course (maximum 3 days) in appropriately aged and sized dogs. The label advises providing the Client Information Sheet and not combining Onsior with other NSAIDs or corticosteroids; any dosing, timing, or medication‑combination questions should be directed to the veterinarian. [Front desk: avoid discussing specific doses.] Common NSAID side effects include vomiting, diarrhea, decreased appetite, and lethargy; as a drug class, NSAIDs can also cause more serious problems such as gastrointestinal ulcer/bleeding and kidney or liver issues. Clients should check with the veterinarian before giving any over‑the‑counter pain medicines or additional prescriptions with Onsior. Escalation: same‑day evaluation is appropriate for vomiting, diarrhea, not eating, or marked lethargy. Emergency: if there is black/tarry stool, blood in vomit or stool, collapse, trouble breathing, severe weakness, or yellow gums/skin, direct the client to the nearest emergency hospital immediately and ask them to bring the medication. Phrases to avoid: “It’s safe to mix with other pain meds,” “Just stop the medication,” or comparisons to human pain meds like ibuprofen/naproxen—defer these to the veterinarian.