Flunixin Meglumine for Ox: 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.

Flunixin meglumine is a prescription NSAID used in cattle to reduce fever, inflammation, and pain. Many pet parents and producers know it by the brand name Banamine. In the U.S., injectable flunixin products for cattle are labeled for slow intravenous use, and transdermal flunixin is labeled for certain specific cattle uses. Your vet chooses the formulation and route based on the animal’s condition, age, production status, and food-safety needs.

This medication does not treat the underlying infection by itself. Instead, it helps control the body’s inflammatory response while your vet addresses the cause. That can matter in sick oxen with high fever, endotoxemia, or severe inflammation, because lowering fever and inflammation may improve comfort, appetite, and willingness to stand or move.

Flunixin is highly protein-bound and works by blocking prostaglandin production. In practical terms, that means it can be very effective, but it also needs careful use in animals that are dehydrated, stressed, or at risk for kidney or digestive tract injury. In food animals, your vet also has to consider meat and milk withdrawal times and whether a planned use is on-label or extra-label.

In cattle, labeled injectable flunixin is used for the control of pyrexia (fever) associated with bovine respiratory disease, control of pyrexia and inflammation associated with endotoxemia, and control of pyrexia associated with acute bovine mastitis. These are the main FDA-recognized uses your vet may discuss when an ox is systemically ill and needs anti-inflammatory support.

Your vet may also consider flunixin as part of a broader treatment plan when an ox is painful, febrile, or showing signs of significant inflammation. Depending on the exact product, transdermal flunixin is approved in cattle for pain control associated with foot rot and also for fever associated with bovine respiratory disease. In these cases, flunixin is usually one piece of care rather than the whole plan.

Because oxen are food animals, not every use, route, or dosing schedule is legally interchangeable. That is why it is important to ask your vet whether the plan is on-label, what withdrawal period applies, and what monitoring is needed if the animal is dehydrated, off feed, or receiving other medications.

For labeled injectable cattle use, flunixin meglumine is typically dosed at 1.1 to 2.2 mg/kg (0.5 to 1 mg/lb, or about 1 to 2 mL per 100 lb for a 50 mg/mL product) by slow IV administration. The label allows dosing once daily as a single dose or the daily amount divided into two doses 12 hours apart, for up to 3 days. The total daily dose should not exceed 2.2 mg/kg. As examples, a 500 lb ox would receive about 5 to 10 mL per dose day, and a 1,200 lb ox would receive about 12 to 24 mL per dose day, depending on where your vet sets the dose.

For Banamine Transdermal in cattle, the labeled dose is a single topical application along the back at 3.33 mg/kg, which corresponds to 1 mL per 15 lb. That product is not interchangeable with injectable flunixin, and your vet should guide exactly when it is appropriate.

Do not change the route on your own. In cattle, route matters for both safety and residue risk. FDA guidance specifically warns that using a drug by an unapproved route can create illegal residues. Your vet should also give you exact instructions for withdrawal times. For labeled injectable cattle use, slaughter withdrawal is 4 days after the last treatment. For Banamine Transdermal, slaughter withdrawal is 8 days, and milk taken during treatment and for 48 hours after treatment must be discarded.

Flunixin should be used cautiously in animals that are dehydrated, in shock, have kidney concerns, or may calve soon. Some labels also state not to use within 48 hours of expected parturition and not to use in bulls intended for breeding because reproductive effects in those classes have not been fully investigated. Your vet is the right person to tailor the plan to the individual ox.

Many oxen tolerate flunixin well when it is used exactly as directed, but side effects can still happen. As an NSAID, flunixin can reduce blood flow to the kidneys in vulnerable animals, especially if they are dehydrated, endotoxemic, or not drinking well. Digestive tract irritation or ulceration is also a concern with NSAIDs, particularly if dosing is too high, treatment lasts too long, or another NSAID or steroid is given at the same time.

Call your vet promptly if you notice worsening depression, poor appetite, diarrhea, dark or tarry manure, teeth grinding, belly pain, reduced urine output, or a sudden drop in milk production in a lactating animal. With transdermal products, reported adverse effects have included application-site reactions such as hair loss, redness, itching, inflammation, or skin lesions. FDA safety-related labeling updates also list reports such as lethargy, vomiting, diarrhea, anorexia, tremors, ataxia, seizures, dermatitis, and death in cattle after transdermal exposure.

Injection technique matters too. Rapid IV administration should be avoided. If a product has visible particles, discoloration, or has been included in a recall notice, do not use it until your vet or supplier confirms it is safe. See your vet immediately if an ox collapses, becomes severely weak, stops eating, or seems much worse after treatment.

The most important interaction rule is this: do not combine flunixin with other NSAIDs or corticosteroids unless your vet specifically directs it. Pairing flunixin with drugs such as aspirin, ketoprofen, meloxicam, dexamethasone, or prednisolone can raise the risk of stomach or intestinal ulceration and kidney injury.

Extra caution is also needed when flunixin is used alongside medications that may affect kidney perfusion or fluid balance. In a sick ox with dehydration, diarrhea, endotoxemia, or poor circulation, even a labeled NSAID dose can become riskier. That does not mean the drug cannot be used. It means your vet may want fluids, closer monitoring, or a different treatment tier.

Because flunixin is used in food animals, interaction planning also includes residue avoidance. If your ox is receiving multiple prescription drugs, ask your vet for a written treatment plan that lists each medication, route, timing, and withdrawal period. Good records protect both the animal and the food chain.