Arthritis Medications: What They Do and How They Work

This is one of the most practical questions I get, and it is usually asked quietly, near the end of a visit: what can I actually take every day?

The answer depends on which medication and on your own medical history, which is unsatisfying — so instead of a list of rules, here is how each of these actually works and what it affects. That makes the conversation with your physician a much better one.

The short answer

Most patients start with acetaminophen, move to an anti-inflammatory if that is not enough and it is safe for them, and use topical options when oral ones are a problem. Each step trades effectiveness against a different set of risks.

How these actually work

Almost all of the confusion around arthritis medication clears up once you understand one enzyme.

Cyclooxygenase — usually shortened to COX — produces prostaglandins, signaling molecules involved in inflammation, pain and a number of ordinary housekeeping functions. It exists in two main forms, and the difference between them explains most of what follows.

• COX-1 is present in tissues all the time. It helps maintain the protective lining of the stomach, supports blood flow through the kidneys, and helps platelets clot.
• COX-2 is produced mainly in response to injury and inflammation. It is the one driving the swelling and pain in an arthritic joint.

Traditional NSAIDs block both. That is why they reduce inflammation effectively and irritate the stomach at the same time — the same mechanism doing both jobs. Medications developed to block COX-2 preferentially were an attempt to keep the anti-inflammatory effect while sparing the stomach lining.

Acetaminophen sits outside all of this. Its mechanism is still not completely settled, but it acts largely within the central nervous system rather than by blocking inflammation at the joint — which is why its risk profile is entirely different.

Acetaminophen

Known by the brand name Tylenol. This is where I usually start, and it is underrated because it is available everywhere and feels unserious.

Its advantages come down to what it does not do:

• It is processed by the liver, not the kidneys, which makes it a reasonable option for many people with reduced kidney function — a group for whom NSAIDs are a genuine problem.
• It is not hard on the stomach. It does not block COX-1, so it does not undermine the stomach lining the way NSAIDs can.
• It does not raise blood pressure the way NSAIDs can in some people.
• It does not thin the blood, which matters around surgery and for anyone on anticoagulation.

The trade-off is that it does not meaningfully reduce inflammation, so for a visibly swollen and inflamed joint it is often less effective than an anti-inflammatory.

A word about aspirin

Worth clearing up, because it causes real confusion.

Many patients think of aspirin as a painkiller. In our practice it is used primarily as a blood thinner — specifically to reduce clot risk after joint replacement, which I go through in aspirin and blood thinners after joint replacement.

At the doses used for that purpose it is not doing much for arthritis pain. If you are taking aspirin because your physician prescribed it, keep taking it — but do not count it as your pain medication, and do tell us you are on it.

NSAIDs

Non-steroidal anti-inflammatory drugs are the workhorse class for arthritis, because they address inflammation rather than only pain.

The ones that come up most:

• Meloxicam — COX-2 preferential, taken once daily because it has a long half-life rather than because it is a slow-release tablet. I like it partly for that simplicity: a once-a-day medication is one people actually remember to take.
• Celecoxib — the most COX-2 selective of the commonly used options, which is its whole design rationale.
• Naproxen and ibuprofen — the familiar non-selective options, available over the counter as well as by prescription.
• Indomethacin — a stronger anti-inflammatory used more often for gout flares than for routine arthritis.
• Diclofenac and oxaprozin — other members of the same class that come up in practice.

A point worth making plainly: these are not interchangeable in how individual people respond. Patients frequently find one NSAID helps when another did nothing, and that is a real observation rather than imagination. It is also why finding the right one is often a matter of trying rather than predicting.

Who needs to be careful with NSAIDs

This is the section I would most want you to read, and the reason I ask about medical history before suggesting one.

NSAIDs as a class carry FDA boxed warnings for cardiovascular events — heart attack and stroke — and for gastrointestinal bleeding and ulceration. Those warnings apply to the COX-2 preferential options too, not only the older ones.

The specific situations where I am cautious:

• Kidney dysfunction. NSAIDs reduce blood flow through the kidneys via COX-1. In someone with already reduced function that matters a great deal.
• Ulcers, significant reflux, or inflammatory bowel disease such as Crohn disease or ulcerative colitis. Blocking COX-1 undermines the stomach's own protection.
• Blood thinners. If you take apixaban, rivaroxaban, warfarin or similar, we generally avoid NSAIDs — the bleeding risks compound.
• Blood pressure. NSAIDs raise blood pressure modestly in a minority of patients, which matters if yours is already difficult to control.
• Heart disease or prior cardiovascular events, given the class warning.

None of these are absolute prohibitions. They change the calculation, and they are exactly what your physician is weighing.

Combination products

For patients who need an anti-inflammatory but are at elevated risk of stomach problems, there are products that pair one with a protective medication.

• Diclofenac with misoprostol — misoprostol is a prostaglandin analog that helps restore some of the stomach protection the NSAID is blocking.
• Naproxen with esomeprazole — pairs the NSAID with a proton pump inhibitor that reduces stomach acid.

A physician may also simply prescribe an acid-reducing medication alongside a standard NSAID, which accomplishes something similar.

Topical medications

Underused, and genuinely useful — particularly for anyone who cannot safely take oral NSAIDs.

Topical diclofenac, sold as Voltaren gel and now available over the counter, delivers an anti-inflammatory through the skin with substantially less systemic absorption than a tablet. That means much less exposure for the stomach and kidneys. It is one of the better-supported non-surgical options for knee arthritis specifically.

The limitation is anatomical: it works better on joints that sit close to the surface. A knee is a reasonable target. A hip is buried under a great deal of soft tissue, and topical medication is unlikely to reach it in a meaningful way.

Capsaicin creams work by a different route, depleting a chemical messenger involved in transmitting pain signals. They typically require consistent use before any effect, and often cause burning initially.

Lidocaine patches numb the area locally. They tend to be more useful for superficial and nerve-related pain than for pain coming from deep inside a joint.

Nerve medications

Gabapentin is not a painkiller in the ordinary sense. It acts on nerve signaling, and it is used where pain has a nerve component — burning, shooting, or radiating pain rather than the deep ache of a worn joint.

It is worth knowing that a good deal of leg pain attributed to a hip or knee is actually coming from the lower back, which is one reason this category exists in an orthopedic conversation at all.

Muscle relaxants

Cyclobenzaprine, methocarbamol, metaxalone and baclofen come up regularly. They address muscle spasm rather than the joint itself, which makes them useful for a specific problem rather than for arthritis generally.

Muscle spasm around an arthritic joint or a painful back is real, and when it is the dominant symptom these help. Drowsiness is the common limitation, and it matters for driving — see driving after joint replacement.

Oral steroids

Prednisone, given either as a pre-packaged dose pack or as a taper over several days, is a powerful anti-inflammatory that can settle a significant flare.

It is not a long-term arthritis treatment. Extended steroid use carries real consequences for bone density, blood sugar and other systems, which is why it is used in short defined courses. Its effect on bone matters particularly for anyone heading toward joint replacement — see bone density and joint replacement.

Injected steroid is a different approach to the same drug class, delivering it directly to the joint — covered in cortisone injections.

Where opioids fit

Briefly, because they are rarely the answer for arthritis and I prescribe them infrequently.

Tramadol is a weaker opioid; oxycodone and similar medications are stronger. Acetaminophen with codeine is also an opioid combination, which patients do not always realize.

Beyond the concerns everyone is aware of, there is a specific issue worth knowing about: opioid-induced hyperalgesia. Long-term opioid use can increase sensitivity to pain, meaning the medication taken to control pain begins contributing to it. That is a genuinely counterintuitive problem and a real one.

The more important point: if you need a narcotic to get through an ordinary day, that is usually telling you something about the joint. The medication is not the problem to solve.

If you need something every day

This is the part worth acting on.

There is a difference between taking something occasionally after a long day and needing something daily in order to walk, sleep or work. The second one is information — not only about the medication, but about how far the arthritis has progressed.

It does not automatically mean you need surgery. Plenty of patients manage well for years with a combination of medication, activity adjustment, strength work and injections — the full range is in non-surgical treatment for hip and knee arthritis.

What it does mean is that this is a sensible point to find out exactly what the joint looks like rather than continuing to manage it by escalating what you take. An examination and a weight-bearing X-ray show how much cartilage is left and whether the alignment has changed. If it turns out to be knee osteoarthritis or hip osteoarthritis, that shapes everything that follows — including the thresholds discussed in signs you need a knee replacement and signs you need a hip replacement.

Before surgery

Two practical points if an operation is on the horizon.

Anti-inflammatories affect bleeding, and there is usually a period before surgery when they are stopped. The specific timing is something we go through as part of planning.

Tell us everything you take — prescription, over-the-counter, topical and supplement. Over-the-counter medications are the ones most often left off the list, precisely because they do not feel like real medications. They are.

The same applies to supplements, some of which affect bleeding as well.