Can Meloxicam Make You Constipated?

Constipation is a recognized side effect of meloxicam, though it is less common than the drug’s other gastrointestinal complaints like nausea, stomach pain, and diarrhea. Meloxicam belongs to the class of nonsteroidal anti-inflammatory drugs (NSAIDs), which are well known for disrupting normal gut function. The connection between meloxicam and constipation is real but often overlooked because people tend to associate NSAIDs with the opposite problem, and because constipation has so many other everyday causes that it can be hard to pin on one medication.

How Common Is Constipation With Meloxicam

Meloxicam’s prescribing information lists constipation among its adverse gastrointestinal reactions. In clinical trials used to gain regulatory approval, constipation showed up in a small but consistent percentage of patients. It was not the most frequent GI complaint; that distinction belongs to diarrhea, dyspepsia, and nausea, each of which appeared more often in trial participants. Constipation fell into a secondary tier of GI effects, alongside flatulence and vomiting, reported by a smaller share of users.

The practical takeaway is that if you start meloxicam and notice your bowel habits slowing down within days or weeks, the drug is a plausible culprit. It would not be an unusual reaction. At the same time, most people who take meloxicam never experience constipation at all, so the risk is modest rather than something to worry about preemptively.

Why an Anti-Inflammatory Drug Affects Your Gut

NSAIDs work by blocking enzymes called COX-1 and COX-2, which produce prostaglandins. Prostaglandins do more than just drive inflammation and pain; they also help regulate how the lining of the stomach and intestines protects itself, how much mucus your gut produces, and how quickly food moves through your digestive tract. When an NSAID dials down prostaglandin production, the gut loses some of that regulatory support.¹

Prostaglandins play a direct role in gut motility, the rhythmic contractions that push food and waste along. When prostaglandin levels drop, those contractions can become less coordinated or slower. In some people that manifests as diarrhea (because the gut lining is irritated and secretes more fluid), and in others it manifests as constipation (because transit slows). Which direction you tip depends on individual biology, hydration, diet, dose, and other medications you take.

Meloxicam is sometimes described as a “preferential” COX-2 inhibitor, meaning it blocks COX-2 more strongly than COX-1. That selectivity is the reason it tends to cause fewer upper-GI problems like stomach ulcers compared to older NSAIDs such as ibuprofen or naproxen. But COX-2 still plays a role in intestinal motility, so even a more COX-2-selective drug can affect bowel habits. The selectivity reduces certain risks without eliminating them entirely.

Meloxicam Versus Other NSAIDs for Gut Symptoms

People often ask whether switching to a different NSAID would solve their constipation. The honest answer is that all NSAIDs carry some risk of GI side effects because they all suppress prostaglandins to some degree. Ibuprofen, naproxen, and diclofenac can all cause constipation in a subset of users, just as meloxicam can. The differences between individual NSAIDs tend to show up more dramatically in upper-GI complications like stomach ulcers and bleeding rather than in bowel-habit changes.

That said, each person’s gut responds differently to different drugs. If meloxicam is consistently making you constipated and you need ongoing anti-inflammatory treatment, your prescriber might trial you on another NSAID or adjust the dose. There is no guarantee a switch will fix the problem, but individual variation is real enough that it is worth discussing. Some people tolerate one NSAID perfectly well and have trouble with another for reasons pharmacology cannot fully predict.

Could the Constipation Be Coming From Something Else

Meloxicam is frequently prescribed for conditions that involve chronic pain, including osteoarthritis, rheumatoid arthritis, and musculoskeletal injuries. People with chronic pain sometimes also take opioid painkillers, and opioids are dramatically more likely to cause constipation than any NSAID. A large retrospective study comparing opioid types in patients with non-cancer pain found that constipation risk increased substantially with higher opioid doses and with stronger opioids like morphine and oxycodone compared to codeine.² If you are taking both meloxicam and an opioid, the opioid is far more likely to be the main offender.

Beyond medications, constipation has a long list of everyday triggers: dehydration, low-fiber diets, reduced physical activity (common when you are in pain), stress, and changes in routine. People sometimes start meloxicam at the same time their activity level drops because of pain, and the inactivity contributes as much as the drug does. Teasing apart these overlapping causes is tricky, but it matters for figuring out the right fix.

There are also less obvious medication interactions. If you take meloxicam alongside antacids or proton pump inhibitors for stomach protection, or calcium supplements, or certain blood pressure drugs, those can independently slow your bowels. The combination of multiple mildly constipating factors can add up to a noticeable problem even when no single agent would cause trouble on its own.

What You Can Do About It

If you suspect meloxicam is slowing your gut, there are practical steps to try before giving up a drug that is otherwise controlling your pain or inflammation well.

Increase fiber gradually: Adding fruits, vegetables, whole grains, or a fiber supplement can counteract the motility slowdown. Increase slowly to avoid cramping and gas.
Stay well hydrated: NSAIDs can subtly affect kidney function and fluid balance. Drinking enough water supports softer stool and easier transit.
Move when you can: Even light walking stimulates intestinal contractions. This is especially relevant if the condition meloxicam is treating has reduced your activity level.
Time your dose with food: Taking meloxicam with a meal is already standard advice for stomach protection. A full meal also stimulates the gastrocolic reflex, the wave of contractions your gut produces after eating, which can offset constipation.
Talk to your prescriber about dose: GI effects from NSAIDs tend to be dose-related. If you are on a higher dose, reducing it (with your prescriber’s guidance) might ease bowel symptoms while still managing your pain adequately.

Over-the-counter osmotic laxatives like polyethylene glycol are generally safe to use alongside meloxicam if lifestyle measures are not enough. Stimulant laxatives are fine for occasional use but are not ideal for daily reliance. If constipation persists for more than a couple of weeks or comes with blood in the stool, significant bloating, or sudden weight loss, see your doctor rather than managing it on your own, as those symptoms warrant investigation beyond medication side effects.

When to Be More Cautious

Certain groups of people are more susceptible to GI effects from NSAIDs in general, and that includes constipation. Older adults tend to have slower gut transit at baseline, and adding a prostaglandin-suppressing drug on top can tip the balance. People with pre-existing irritable bowel syndrome, especially the constipation-predominant type, sometimes find that NSAIDs worsen their symptoms. If you already struggle with regularity, it is worth flagging that to whoever prescribes meloxicam so they can monitor or choose an alternative.

People taking meloxicam long-term for chronic conditions are more likely to notice bowel changes than someone using it for a week after a minor injury. Short courses tend to produce less noticeable effects simply because the exposure window is smaller. If you are only taking meloxicam for a few days, any constipation is likely mild and self-resolving once you stop.

Kidney function matters here too. Meloxicam, like all NSAIDs, can reduce blood flow to the kidneys, which in turn affects fluid balance in the body. When the body retains less fluid in the right places, stool can become harder and more difficult to pass. This is another reason adequate hydration is more important when you are on an NSAID than it is normally.

The Gut Microbiome Angle

An emerging area of research looks at how NSAIDs interact with the trillions of bacteria living in the intestines. There is growing evidence that NSAIDs alter the composition of gut bacteria, and that this shift may contribute to some of the GI symptoms people experience. While most of this research has focused on upper-GI damage like ulcers, the microbiome also plays a role in how quickly or slowly waste moves through the colon. If NSAIDs disrupt the microbial communities that help regulate motility, that could partly explain why some people get constipated while others get diarrhea on the same drug.

This research is still in relatively early stages, and no one is prescribing probiotics alongside meloxicam based on it yet. But it is an interesting piece of the puzzle and may eventually explain the frustrating variability in how different people respond to the same NSAID. For now, the practical implication is modest: maintaining a diet that supports a diverse gut microbiome (plenty of fiber, fermented foods, variety) is unlikely to hurt and may help.

Meloxicam and Constipation in Pets

If you found your way here because your dog or cat is on meloxicam and seems constipated, you are not alone. Meloxicam is one of the most commonly prescribed NSAIDs in veterinary medicine, particularly for osteoarthritis in cats and dogs. GI upset is the most frequently reported side effect in animals as well. In a study of cats treated with low-dose oral meloxicam for osteoarthritis over an extended period, gastrointestinal upset occurred in about 4% of the animals, and that was the only adverse effect noted.³

The term “gastrointestinal upset” in veterinary studies typically covers a range of symptoms including vomiting, diarrhea, and reduced appetite, with constipation being less commonly reported than the others. Cats in particular are prone to constipation from other causes (dehydration, kidney disease, low-fiber diets), so distinguishing between meloxicam-related constipation and background constipation in an older arthritic cat can be difficult. If your pet’s bowel habits change after starting meloxicam, bring it up with your vet. Dose adjustments in animals can make a significant difference because veterinary meloxicam dosing is already quite low compared to human dosing.

Diarrhea Is More Commonly Reported, but That Does Not Rule Out Constipation

One reason constipation from meloxicam gets less attention is that diarrhea is the more frequently reported lower-GI complaint with NSAIDs. When drug safety reviews discuss NSAID gastrointestinal effects, the spotlight falls on ulcers, bleeding, diarrhea, and dyspepsia. Constipation tends to be mentioned in passing, which can make patients feel like their experience is unusual or unrelated to the drug.

It is not unusual at all. The mechanism that causes diarrhea in some people (disrupted prostaglandin signaling in the gut) is the same mechanism that can cause constipation in others. Individual differences in gut sensitivity, baseline motility, fluid intake, and the rest of your medication list determine which direction the effect goes. If anything, the fact that meloxicam clearly affects gut function should make constipation a predictable minority outcome rather than a surprising one.

The underreporting may also stem from patients themselves. Constipation is one of the most under-discussed symptoms in medical consultations. People often assume it is a personal or dietary issue rather than a medication side effect, and they do not mention it to their prescriber. Meanwhile, diarrhea and stomach pain are more alarming and more likely to prompt a conversation. If you are experiencing constipation on meloxicam, reporting it to your doctor helps build a more accurate picture of how the drug affects real patients outside of clinical trials, and it opens the door to solutions you might not find on your own.