Meloxicam for Horses: 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.

Meloxicam is a prescription nonsteroidal anti-inflammatory drug (NSAID) used by vets to reduce pain, inflammation, and fever. It belongs to the oxicam class and is considered relatively COX-2 selective, which means it may spare some normal protective prostaglandin activity compared with less selective NSAIDs. That said, it is still an NSAID, so stomach, colon, kidney, and sometimes liver side effects remain possible.

In horses, meloxicam is commonly used extra-label in the United States. Merck notes that meloxicam is available in several formulations, including oral suspension and injectable products, but equine approval varies by country. Because U.S. equine use is generally extra-label, your vet will decide whether meloxicam is appropriate, what formulation to use, and how long treatment should continue.

For many horses, meloxicam is considered when a pet parent and vet want an oral anti-inflammatory option for orthopedic pain, recovery after certain procedures, or situations where another NSAID may not be the best fit. It does not fix the underlying problem by itself. Instead, it helps make the horse more comfortable while your vet addresses the cause of pain.

Vets most often use meloxicam in horses for pain and inflammation linked to musculoskeletal disease. That can include osteoarthritis, back soreness, soft tissue injury, hoof pain, and some chronic lameness cases. Merck specifically describes meloxicam as being used for acute and chronic inflammation associated with musculoskeletal disease and for postoperative pain.

Your vet may also consider meloxicam as part of a broader plan after dental work, minor surgical procedures, or other painful conditions where an NSAID is appropriate. In some practices, it is chosen when a horse needs a medication that can be measured carefully as a liquid, or when a horse has not tolerated another NSAID well.

Meloxicam is not a substitute for diagnosis. If your horse has colic signs, diarrhea, dehydration, poor appetite, ventral edema, or weight loss, pain control alone can mask a serious problem. See your vet immediately if those signs are present, especially before giving another dose of any NSAID.

Meloxicam dosing in horses should come only from your vet, because equine use is usually extra-label in the U.S. Published equine references and clinical use commonly center around about 0.6 mg/kg by mouth once daily for short-term use, although some vets use different protocols depending on the condition, the formulation, and whether a loading dose is needed. Dose adjustments matter in foals, seniors, dehydrated horses, and horses with kidney, liver, or gastrointestinal risk.

The exact milliliter amount depends on the product concentration. For example, many small-animal oral suspensions are 1.5 mg/mL, so a 500 kg horse at 0.6 mg/kg would need 300 mg total, which equals 200 mL of a 1.5 mg/mL liquid. That large volume is one reason your vet may choose a different formulation, a compounded product, or a different NSAID entirely. Never calculate from a dog syringe or dog weight chart for a horse.

Meloxicam is usually given with a careful review of hydration status, ulcer risk, and any other medications. Horses on longer courses may need bloodwork and monitoring, because NSAID injury can affect the stomach, right dorsal colon, kidneys, and sometimes liver enzymes. If your horse stops eating, develops diarrhea, seems dull, or drinks less while on meloxicam, contact your vet before the next dose.

Common NSAID-type side effects in horses include decreased appetite, mild colic signs, soft manure or diarrhea, lethargy, and reduced water intake. Some horses also develop oral irritation or ulcers, especially if they are sensitive to NSAIDs or receive higher doses than intended.

More serious complications can involve the stomach and large colon, especially right dorsal colitis, a form of NSAID-associated intestinal injury. Merck describes signs such as anorexia, lethargy, weight loss, diarrhea, colic, and ventral edema from protein loss. NSAIDs can also cause kidney damage, particularly in horses that are dehydrated, hypovolemic, critically ill, or receiving other potentially nephrotoxic drugs.

See your vet immediately if your horse has persistent diarrhea, colic, swelling under the belly or limbs, trouble eating, marked depression, reduced urination, or sudden worsening after starting meloxicam. Even though meloxicam may be gentler on the stomach than some less selective NSAIDs, no NSAID is risk-free in horses.

The most important interaction is with other NSAIDs or corticosteroids. Meloxicam should generally not be combined with drugs such as phenylbutazone, flunixin meglumine, firocoxib, ketoprofen, aspirin, dexamethasone, prednisolone, or triamcinolone unless your vet has a very specific reason and a washout plan. Combining these drugs can sharply increase the risk of ulcers, right dorsal colitis, and kidney injury.

Use extra caution if your horse is also receiving medications that can stress the kidneys, such as gentamicin or amikacin, or if the horse is dehydrated from colic, diarrhea, fever, or transport stress. Highly protein-bound drugs may also compete with meloxicam, which is another reason your vet should review the full medication and supplement list.

You can help prevent problems by telling your vet about every product your horse gets, including ulcer medications, joint injections, supplements, compounded drugs, and any recent NSAID doses. Do not switch from one anti-inflammatory to another without asking about timing, because the safest interval depends on the horse, the drugs involved, and the reason for treatment.