Hi! I’m Katey, a holistic equine nutrition and certified functional osteopath. I specialize in natural horse care and talk everything crunchy, herbal, and holistic. My passion is helping owners support their horses through species‑appropriate nutrition, environment, and whole‑body balance — creating lasting health, preventing disease, and helping horses feel their absolute best.
Most horse owners know that NSAIDs help with pain, but very few understand how they work or what they actually do inside the body. Even fewer realize that the different NSAIDs commonly used in horses don’t all work the same way, and this matters more than most people realize. The key is COX selectivity.
Inside the horse’s body, there are two main COX enzymes.
COX‑1 is the “housekeeping” enzyme that protects the stomach lining, supports kidney blood flow, and maintains gut integrity. This is the one you want functioning normally. COX‑2 is the inducible enzyme that kicks in during injury and inflammation, and this is the one medications aim to block.
The problem is that older NSAIDs can’t tell the difference between them, and that’s where the trouble begins.
Phenylbutazone (bute) is non‑selective and blocks both COX‑1 and COX‑2 aggressively, giving it the highest GI and kidney risk of the group. It has a well‑established link to gastric ulcers, right dorsal colitis, and kidney stress, especially at higher doses or with long‑term use. Flunixin meglumine (Banamine) is also non‑selective. It’s commonly used for colic and acute pain, and while it has a strong anti‑inflammatory effect, it also strongly suppresses COX‑1. Repeated use is particularly associated with right dorsal colitis.
Firocoxib (Previcox/Equioxx) is the most COX‑2 selective of the group. It spares more COX‑1, which is why it’s often described as “easier on the gut,” and relatively speaking, it is. But COX‑2 selective does not mean ulcer‑free or kidney‑safe. It still suppresses protective prostaglandins, and the FDA label still says 14 days.
This is not my opinion — The Equioxx label reports oral mucosal and skin lesions around the mouth and kidney damage as common adverse effects, and like other NSAIDs, firocoxib carries risk for gastrointestinal issues — especially with extended use. Clinical experience and broader NSAID literature associate long‑term NSAID use with issues such as ulcers, right dorsal colitis, kidney stress, diarrhea, weight loss, limb swelling, and changes in blood proteins; loss of appetite; low blood protein levels; weight loss; limb swelling; and jaundice.
Read that list again. How many of those have you seen in your horse and attributed to something else?
Ulcers, weight loss, fecal water, loose stools, lethargy, decreased appetite, leg swelling.
But in my practice, I very rarely see horses on long‑term NSAIDs being monitored at all. I have clients on their third gastroscope because the horse “isn’t responding” to ulcer treatment while still on daily NSAIDs. I’ve had clients whose horses went into kidney failure in their early or mid‑teens on long‑term Equioxx. I see horses with chronic diarrhea and fecal water, and no one is considering the NSAIDs. I see horses with chronic back pain over their kidneys, and when the NSAIDs are stopped, the pain disappears.
This is why I’m talking about this. This is why I’m sharing my experience.
“My vet switched us to Previcox because it’s gentler” is a meaningful clinical decision, but it doesn’t change the fundamental issue. The signal is still being turned down. The root cause is still there.
The question isn’t which NSAID is safest. The question is why your horse needs one at all — and whether that’s been seriously investigated. And I will state again, there are circumstances where long term pain management IS the best option.
Many horses aren’t just on NSAIDs for arthritis or diagnosed conditions — they’re often on them for a wide range of vague, unexplained, or misunderstood symptoms. I frequently see horses put on Equioxx for undiagnosed lameness that no one can pinpoint, even after multiple exams. I also see horses placed on a “trial” of NSAIDs simply to “see if it helps,” which is odd when you think about it — because all it tells you is whether pain was present, not why the pain exists or what system is actually struggling.
Beyond physical discomfort, many horses are prescribed NSAIDs for behavior problems that are actually rooted in pain, gut irritation, mineral imbalance, hoof mechanics, or structural restriction. In all of these cases, the medication may temporarily quiet the symptom, but it does nothing to identify or resolve the underlying issue.
And here’s the good news: There are often things you can do to help manage your horse’s pain and inflammation other than long‑term medication — you just haven’t tried them yet.
To be clear, this conversation is not about demonizing medication. NSAIDs absolutely have their place, and almost every horse owner will use them at some point. Some lameness studies report up to an 80% improvement on Equioxx. They can play a crucial role in acute pain management, post‑surgery recovery, short‑term injury support, fever reduction, and situations where a horse genuinely needs fast relief while a deeper issue is being addressed. They can make a horse comfortable enough to move, eat, and function during periods when movement is essential for healing.
The problem isn’t the medication itself — it’s when these drugs quietly shift from short‑term tools into long‑term daily management without anyone asking why the horse needs them.
If a horse is going to be on NSAIDs long term, there should be preventative measures in place: monitoring kidney values, watching gut health closely, adjusting diet to reduce inflammation, supporting the microbiome, and regularly reassessing whether the underlying issue has been identified. Medication can be part of a thoughtful plan — but it should never replace investigating the root cause or supporting the horse’s body in a way that reduces the need for medication in the first place.
My Holistic Approach to Pain: Why the Root Cause Matters More Than the Medication
This is the foundation of my work: pain is never random. It is always a signal. And if we don’t ask why that signal is happening, we end up treating the noise instead of the message.
Before I ever consider long‑term NSAIDs, I start with one question: What is actually driving the inflammation?
For example: If the pain is from arthritis, I want to understand why that joint is inflamed. Is it mechanical overload? Poor hoof balance? A mineral imbalance? A pro‑inflammatory diet? Chronic stress? Gut irritation that’s spilling over into systemic inflammation? Early metabolic dysfunction? Overuse? Compensation from an old injury?
Every one of these creates inflammation — just through different pathways. And every one requires a different plan.
When you skip this investigation and simply add medication, you may quiet the symptom, but you don’t resolve the cause. The body keeps sounding the alarm, and the medication keeps turning it down. Over time, this creates the cascade I see constantly in practice:
more pain → more medication → more gut irritation → more systemic inflammation → more pain → more interventions
This is why my first line of defense is always root‑cause investigation and whole‑body support, not suppression.
I look at the horse’s diet, mineral balance, forage quality, stress load, turnout, movement patterns, hoof mechanics, posture, gut health, and metabolic stability. I support the microbiome, reduce inflammatory triggers, improve tissue resilience, and restore balance through nutrition, environment, and osteopathic work.
When you address the systems that create inflammation, the need for pain medication naturally decreases — because the body isn’t fighting itself anymore.
Pain management should never be about chasing symptoms. It should be about restoring function.
Medication can absolutely be part of a thoughtful plan, but it should never replace the deeper work of understanding why the horse is hurting in the first place.
Apply for your online consultation today:
https://kcequinewellness.ca/pages/holistic-nutrition
Follow KC Equine Wellness on Facebook:
https://www.facebook.com/kcequinewellness
Subscribe to my YouTube channel:
https://www.youtube.com/@KCEquineWellness
Explore more articles on my blog: