Onsior® Solution for Cats

Onsior® is a veterinary NSAID injection used to control postoperative pain and inflammation in cats. Border Free Health offers US delivery from Canada so you can manage care confidently. This page explains how the medicine works, who it suits, and how it is typically used, including options if you are paying without insurance.

What Onsior Is and How It Works

Onsior® contains robenacoxib, a nonsteroidal anti-inflammatory drug that selectively inhibits COX-2 enzymes. By reducing prostaglandin production at surgical sites, this medicine can help ease pain and swelling after procedures. It is designed for short courses in cats and is usually given around the time of surgery.

Border Free Health connects U.S. patients with licensed Canadian partner pharmacies; prescriptions are verified with prescribers before dispensing.

As a category, COX-2–selective NSAIDs aim to minimize inflammatory mediators while sparing protective COX-1 pathways. Robenacoxib Solution is formulated for subcutaneous use so a clinician can time dosing around anesthesia and recovery.

Who It’s For

This treatment is indicated for cats to control postoperative pain and inflammation associated with soft tissue and orthopedic surgery. It is not for use in cats with gastrointestinal ulceration or bleeding. Vets may avoid it in dehydrated, hypovolemic, or hypotensive cats, and use caution in those with pre-existing kidney issues. Kittens under labeled age or very small body weight may not be candidates. Always follow the veterinary label and your prescriber’s direction.

Dosage and Usage

Robenacoxib Injection is typically administered subcutaneously by a veterinarian. The first dose is often given prior to the start of surgery, then once daily for a short period, usually up to three days. The exact schedule comes from the approved label and your cat’s clinical status.

General administration notes:

• Given by a veterinary professional in most cases
• Timed around anesthesia and recovery
• Short course designed for postoperative use
• Do not combine with other NSAIDs or corticosteroids

If you are ever instructed to give a dose at home, use the materials and technique provided by your veterinary team. Do not change the dosing schedule without veterinary guidance.

Strengths and Forms

Onsior Solution 20 mg/mL is supplied as a sterile solution for subcutaneous injection. Packaging configurations may vary by supplier and country of origin.

Other presentations exist, including oral tablets for cats. If an oral option is preferred after the perioperative period, your prescriber may discuss whether a switch makes sense for your cat’s recovery needs.

Missed Dose and Timing

When dosing is handled in-clinic, the care team will manage timing. If you are directed to give a dose at home and one is missed, administer it when remembered unless it is close to the next scheduled time. Do not double doses. If you are unsure how to proceed, contact your veterinary clinic for instructions.

Storage and Travel Basics

Store vials in a secure location out of reach of children and pets. Keep the container closed until use and protect it from excess heat or moisture. Do not use the solution if it looks discolored, cloudy, or contains particles. During travel, pack the vial upright in a protective case and keep it with your paperwork. Clinics and pharmacies handle temperature-controlled handling when required.

For clinic-to-home transport, ask the veterinary team about packing and labeling recommendations. Robenacoxib 20 mg/mL injection should be transported in accordance with the label and your clinic’s policies. Never share prescription medicines between animals.

Benefits

This NSAID class can help reduce pain and inflammation after surgery, which may support smoother recovery and comfort. An injection allows the team to dose precisely around the procedure, avoiding the need to give a tablet when your cat is sedated or nauseated. Short-course use reduces the duration of exposure while still providing perioperative relief.

Side Effects and Safety

With Onsior Injectable Solution, common effects may include:

• Vomiting or decreased appetite
• Diarrhea or soft stool
• Lethargy
• Injection-site discomfort

Serious effects are less common but can include gastrointestinal ulceration or bleeding, kidney-related changes, and rare hypersensitivity reactions. Risk can increase with dehydration, pre-existing kidney disease, or the use of other NSAIDs or corticosteroids. Stop treatment and contact your veterinary clinic if your cat shows persistent vomiting, black or bloody stool, marked lethargy, or difficulty breathing.

Drug Interactions and Cautions

NSAIDs may interact with diuretics, ACE inhibitors, anticoagulants, and other drugs that are highly protein-bound. Combining this therapy with another NSAID or a corticosteroid can raise the risk of gastrointestinal and kidney adverse effects. Use caution in cats with kidney, liver, or gastrointestinal disease, and ensure adequate hydration around anesthesia. Lab monitoring may be advised for higher-risk cats per the prescriber’s judgment.

What to Expect Over Time

Pain control typically begins after the first injection, with continued benefit across the short perioperative course. You may notice improved comfort, posture, and willingness to move as your cat recovers. Individual responses can vary based on procedure type and baseline health. Follow your clinic’s recovery plan, including rest, restricted activity, and any additional medicines prescribed.

Compare With Alternatives

Some cats transition to an oral option after hospital discharge. Your prescriber may consider Onsior® Cat tablets for short-term postoperative use when appropriate. For clinic-administered alternatives, Metacam Solution for Injection (meloxicam) may be used under veterinary supervision. The right choice depends on your cat’s medical history, procedure type, and the prescriber’s evaluation.

Pricing and Access

Border Free Health lists current options so you can review the Robenacoxib Solution cash price and compare pack sizes. Canadian pricing is shown in USD at checkout for transparency. We provide US shipping from Canada with clear, step-by-step ordering.

Looking for seasonal offers? See our Promotions page for current deals where available. Prescription verification is required before dispensing.

For perioperative plans, your clinic can send the prescription directly, or you can upload it during checkout. If timing is critical, contact your clinic to coordinate administration and pickup.

Availability and Substitutions

Stock may vary by lot and supplier. If this item is temporarily unavailable, a prescriber may recommend a suitable alternative or a different form. We cannot provide restock dates, but our team can help you review comparable options that meet your cat’s clinical needs.

Patient Suitability and Cost-Saving Tips

Cats needing short-term postoperative pain control may benefit from this therapy when a vet deems it appropriate. It may not be suitable for cats with active gastrointestinal disease, significant kidney or liver impairment, or for very young or underweight kittens. Share your cat’s full medication list and health history with the prescriber.

To help manage costs and coordination:

• Plan ahead with your clinic for perioperative dosing
• Ask if a small supply is needed for home use
• Combine any additional approved items in one order
• Set calendar reminders for post-op check-ins
• Store supplies properly to avoid waste

Questions to Ask Your Clinician

• Is this NSAID the best choice for my cat’s surgery type?
• What monitoring should we do after each dose?
• Could my cat switch to an oral option after discharge?
• Which medicines should we avoid while using this treatment?
• What signs mean we should stop and call the clinic?

Authoritative Sources

Elanco (Manufacturer)FDA DailyMedHealth Canada Drug Product Database

Learn more about related care and recovery topics in our guides: see Cat Pain Signs, browse our Pet Medications category, consider perioperative antiemetics like Cerenia Injection, and explore the Acute Pain collection for broader context. For infections diagnosed by your vet, Baytril Injection may be part of a separate plan when appropriate. Country-of-origin details are listed under Canada on many product pages.

Ready to proceed? Place your order for your cat’s postoperative care with prompt, express shipping, plus careful handling and temperature-controlled handling when required. This information is educational and does not replace your veterinarian’s advice or the official label.