Relafen is a prescription anti-inflammatory medication used to treat osteoarthritis and rheumatoid arthritis. Its generic name is nabumetone, and it belongs to the class of drugs known as NSAIDs (nonsteroidal anti-inflammatory drugs). Like other NSAIDs, it reduces pain, swelling, and stiffness in the joints, but it works in an unusual way that may offer a slight advantage for your stomach compared to some alternatives.
Conditions Relafen Treats
Relafen is FDA-approved for the acute and chronic treatment of osteoarthritis and rheumatoid arthritis. It addresses three core symptoms: inflammation, pain, and fever. In practice, it’s most often prescribed for the ongoing joint pain and stiffness of osteoarthritis, the most common form of arthritis, and for the inflammatory flare-ups of rheumatoid arthritis.
It is not a cure for either condition. Relafen manages symptoms so you can move more comfortably and maintain daily function, but the underlying disease process continues. For rheumatoid arthritis in particular, it’s typically used alongside other medications that target the immune system’s role in the disease.
How Relafen Works in the Body
Relafen is what pharmacologists call a prodrug. The tablet you swallow is only weakly active on its own. Once it reaches your liver, your body converts it into a different compound that is a potent blocker of prostaglandin production. Prostaglandins are chemicals your body makes at sites of injury or inflammation. They amplify pain signals, drive swelling, and increase sensitivity in the affected area. By cutting prostaglandin production, Relafen’s active form dials down all three.
This prodrug design matters for one practical reason: because the original compound is mostly inactive until it’s processed by the liver, it causes less direct irritation to the lining of your stomach and intestines compared to NSAIDs that are already active when you swallow them. A 12-week endoscopy study published in The American Journal of Medicine found that nabumetone was significantly less toxic to the gastrointestinal tract than naproxen. That’s notable given that up to 40 percent of arthritis patients on long-term NSAID therapy develop significant stomach lesions, with about 20 percent of those being actual ulcers.
Typical Dosage
The standard starting dose is 1,000 mg taken once a day, with or without food. If that doesn’t provide enough relief, your prescriber may increase the dose to 1,500 or 2,000 mg per day. Doses above 2,000 mg daily have not been studied. The once-daily dosing is a convenience advantage over NSAIDs that require two or three doses throughout the day.
Common Side Effects
The most frequently reported side effects are digestive: nausea, stomach pain, bloating, gas, diarrhea, and indigestion. Headache, skin rash or itching, and swelling also come up often. Less common but still possible are dizziness, dry mouth, ringing in the ears, difficulty sleeping, and increased sweating. Most of these are mild and tend to improve as your body adjusts.
Serious Risks to Know About
Like all NSAIDs, Relafen carries two major safety concerns that apply regardless of the specific drug in this class.
Stomach and Intestinal Bleeding
NSAIDs can cause ulcers, bleeding, or holes in the stomach or intestinal wall. These events can happen at any point during treatment, sometimes without any warning symptoms beforehand. Your risk is higher if you’ve had a stomach ulcer before, if you smoke or drink alcohol regularly, if you’re over 60, or if you take blood thinners or steroid medications at the same time. Warning signs include severe stomach pain, black or tarry stools, and vomiting blood or material that looks like coffee grounds.
Cardiovascular Events
NSAIDs may increase the risk of heart attack and stroke, and this risk can grow with longer use. People who already have heart disease or risk factors for it face greater danger. Relafen should not be used around the time of coronary artery bypass surgery.
Kidney and Liver Problems
Relafen can affect kidney function, particularly in older adults who are more likely to have some degree of age-related kidney decline. Signs of a kidney problem include bloody or decreased urine, swelling in the face or lower legs, unusual weight gain, and increased thirst. Liver trouble can show up as pain or tenderness in the upper stomach. People with severe kidney disease should not take this medication.
Who Should Not Take Relafen
Relafen is not appropriate for anyone with a history of aspirin-sensitive asthma or aspirin allergy. People in this group can experience severe, potentially life-threatening breathing reactions when exposed to NSAIDs. It’s also off-limits for those with severe kidney disease. If you’ve had allergic reactions to other NSAIDs like ibuprofen or naproxen, the same caution applies.
Older adults can take Relafen, but they need closer monitoring. Age-related changes in kidney, liver, and stomach function all increase the likelihood of side effects, and the consequences of complications like GI bleeding are more serious in this group.
How Relafen Compares to Other NSAIDs
Relafen sits in the same broad category as ibuprofen, naproxen, and other over-the-counter and prescription anti-inflammatories. Its main practical differences are the once-daily dosing and the prodrug mechanism that reduces direct stomach irritation. The endoscopic evidence showing less GI damage than naproxen is meaningful if you need long-term NSAID therapy and have concerns about your stomach. That said, the serious GI risks (bleeding, ulceration, perforation) still apply. The prodrug design reduces casual irritation, not the deeper prostaglandin-related risk that all NSAIDs share.
In terms of pain and inflammation control, nabumetone performs comparably to other prescription-strength NSAIDs. The choice between them often comes down to how well you tolerate a particular drug, how convenient the dosing schedule is, and whether you have specific risk factors that favor one option over another.