Is Metacam for Cats and Dogs the Same?

You grab the bottle your dog had for arthritis, and your cat is limping. It looks like the same oral suspension, same brand name — why not just squirt a little into the bowl? That kind of logic makes perfect sense until you realize the drug isn’t interchangeable by species, and getting it wrong can be dangerous.

The honest answer is that while both versions contain meloxicam, the product approved for dogs and the one for cats differ in concentration, FDA-approved use, and safety margin. Giving a cat a dog-sized dose — or giving repeated oral meloxicam to a cat — carries a well-documented risk of kidney failure.

What Is Metacam and How Does It Work?

Metacam is a brand name for the prescription nonsteroidal anti-inflammatory drug meloxicam. It works by reducing hormones that cause inflammation and pain in the body — the same mechanism as human NSAIDs like ibuprofen, but veterinary-specific dosing makes it safer for pets under supervision.

Meloxicam is FDA-approved in dogs for the control of pain and inflammation associated with osteoarthritis, with a labeled dosing schedule for repeated daily use. In cats, the approved product is a single, one-time injection given perioperatively to control pain after spaying, neutering, or orthopedic surgery.

Only two NSAIDs are FDA-approved for cats: meloxicam (as a one-time injection) and robenacoxib (brand name Onsior). No oral meloxicam product is approved for repeated use in cats in the United States.

Why People Assume They’re Interchangeable

It’s easy to see why the confusion sticks. Both products carry the Metacam label, both contain meloxicam, and both are prescribed by veterinarians. But the details that matter — concentration, dosing schedule, and safety profile — are not the same. Here are the common misconceptions and what you actually need to know.

• Same active ingredient, different strength: The active drug is meloxicam in both, but the dog oral suspension contains 1.5 mg/mL, while the formulation intended for cats is 0.5 mg/mL — three times less concentrated. Veterinary resources widely note this difference, though the exact figures come from product labeling rather than a direct .gov comparison.
• Repeated use approved for dogs, not cats: Dogs can receive meloxicam daily for osteoarthritis; cats are approved only for a single perioperative injection. Repeated oral meloxicam in cats is extra-label and carries an FDA boxed warning for acute renal failure and death.
• Different metabolism and safety margin: Cats metabolize meloxicam differently than dogs, with a narrower safety margin. Small dosing errors or dehydration can lead to toxicity, which is why the FDA restricts feline approval to a single dose.
• Shelf life difference: The cat oral suspension has a shorter shelf life once opened (approximately 14 days) compared to the dog version (roughly 6 months), due to differences in preservative systems. This is cited by veterinary forums and should be taken as approximate guidance.

The FDA’s Warning on Meloxicam for Cats

The FDA is clear: repeated use of meloxicam in cats has been associated with acute renal failure and death. The agency’s boxed warning on meloxicam labels states: “Do not administer additional injectable or oral meloxicam to cats.” That language is on the product label for good reason — the FDA boxed warning cats page explains the safety risk in detail.

A 2024 peer-reviewed study found that oral meloxicam given at a very low dose (0.01–0.03 mg/kg with food) may be safe and palatable for long-term treatment of osteoarthritis in cats. However, the study explicitly states this is an extra-label protocol — not FDA-approved — and any such use should be strictly under veterinary supervision with careful monitoring of kidney function.

This is a good reminder that new research can shift understanding, but for now the FDA’s regulatory position remains: one injection, no repeated oral meloxicam, and never a product meant for dogs.

Key Differences You Need to Know

If you’re tempted to use Metacam across species, these five factors should stop you from making a guess. Always rely on your veterinarian for any pain management decision.

1. Concentration mismatch: The dog oral suspension (1.5 mg/mL) is triple the strength of the cat formulation (0.5 mg/mL). A single “dog dose” given to a cat could deliver three times the intended amount, putting the cat in the danger zone.
2. Dosing schedule varies by species: Dogs often start with a loading dose on day one, then a lower maintenance dose daily. Cats — when used extra-label — typically receive a microdose (0.01–0.03 mg/kg) once every 24 to 48 hours, and only with food to reduce kidney stress.
3. Cat metabolism is less forgiving: Cats have a limited ability to metabolize NSAIDs. Dehydration, concurrent kidney disease, or even a slightly warm day can push a cat from a safe dose to a toxic one faster than in dogs.
4. Different routes of administration: The only FDA-approved feline Melacam is injectable (5 mg/mL), given once. Oral formulations for cats are all extra-label. Dog Metacam is approved for both injection and oral suspension depending on the product.
5. Never share between species: The FDA advises pet owners to never give a dog or cat any NSAID without a prescription, and to never use a product labeled for one species in another species without explicit veterinary guidance.

What Should You Do If Your Pet Needs Pain Relief?

The safest route is a veterinary visit. Your veterinarian can determine which pain medication is appropriate — whether it’s meloxicam for your dog’s osteoarthritis, a single injection for your cat’s surgery, or another class of analgesics like gabapentin or opioids for acute pain.

If your cat needs long-term pain management, options do exist. Robenacoxib (Onsior) is FDA-approved for cats for repeated use up to three days, though it is a different NSAID class. The 2024 study on low-dose oral meloxicam is promising, but it is extra-label and requires regular kidney monitoring. The official Metacam For Cats And dogs labeling from NLM clearly shows the differences in approved use.

Never reach for a dog’s Metacam bottle when your cat is in pain. A single well-intentioned dose can land a cat in the emergency room. If you suspect your pet needs pain relief, call your veterinarian first — they can guide you on dose, timing, and whether an alternative drug is safer for your specific pet.

The Bottom Line

Metacam for cats and dogs is the same drug but not the same medicine. Different concentrations, different FDA-approved uses, and different safety margins mean you cannot treat them as interchangeable. Repeated oral meloxicam in cats is particularly dangerous — it carries an FDA boxed warning for acute renal failure and death.

Your veterinarian is the person to consult about pain management for your cat or dog. They can weigh your pet’s specific age, kidney function, and other medications to choose the safest option — whether that’s a single injection, a microdose under monitoring, or a different NSAID entirely. Never guess with NSAIDs; the margin for error is too small.