If you’ve been struggling with knee or hip pain from osteoarthritis, you’ve probably heard about diacerein. It’s not a name you hear every day like ibuprofen or glucosamine, but in some parts of the world, it’s been used for decades to ease joint discomfort. Now, some people are wondering-could diacerein also help with weight loss? And if it does, does that mean it’s secretly helping your joints by making you lighter?
What exactly is diacerein?
Diacerein is a prescription medication used mainly to treat osteoarthritis, especially in the hips and knees. It’s not a painkiller like acetaminophen or an NSAID like naproxen. Instead, it works differently. Diacerein breaks down into rhein in your body, which slows down the inflammation that breaks down cartilage over time. Think of it less like a bandage for pain and more like a slow-acting repair crew for your joints.
It’s approved in over 60 countries, including India, Brazil, and across Europe. But in the U.S., it’s never been approved by the FDA. That’s partly because early studies showed mixed results and some users had digestive side effects-diarrhea was common, especially at first. Still, doctors in places like Australia and Spain still prescribe it when other treatments haven’t worked.
How does diacerein affect joint pain?
Unlike pain relievers that mask symptoms, diacerein targets the root problem: cartilage breakdown. A 2018 meta-analysis published in Osteoarthritis and Cartilage found that people taking diacerein reported 20-30% less joint pain over six months compared to placebo. The real benefit? It didn’t just numb the pain-it seemed to slow the progression of joint damage. That’s rare.
One study followed 400 patients with knee osteoarthritis for two years. Those on diacerein had less narrowing of the joint space on X-rays than those on placebo. That’s a big deal because joint space narrowing is one of the clearest signs that osteoarthritis is getting worse. Diacerein doesn’t reverse damage, but it might stop it from getting worse faster.
Is there a link between diacerein and weight loss?
Here’s where things get interesting-and confusing. Some patients taking diacerein report losing a few pounds. But that’s not because diacerein is a fat burner. It’s because of a side effect: mild diarrhea.
Up to 25% of people using diacerein experience loose stools, especially in the first 4-6 weeks. That’s not a designed weight loss effect-it’s an unwanted one. And while you might lose a couple of pounds from fluid loss or reduced appetite, it’s not fat loss. Once your body adjusts, the diarrhea usually fades, and so does the weight drop.
There’s no scientific evidence that diacerein changes metabolism, suppresses appetite, or increases fat burning. A 2021 review in Clinical Rheumatology specifically looked for metabolic effects and found nothing. Any weight loss tied to diacerein is temporary and not healthy or sustainable.
Could losing weight help your joints more than diacerein?
If you have osteoarthritis and carry extra weight, losing even 5-10% of your body weight can cut joint pain in half. For someone who weighs 200 pounds, that’s just 10-20 pounds. Studies from the Arthritis Foundation show that this kind of weight loss reduces pressure on the knees by up to 40 pounds per step.
Diacerein helps with inflammation. Weight loss helps with mechanical stress. They work on different problems. If you’re trying to reduce joint pain, weight loss is a stronger, safer, and longer-lasting solution than diacerein. And unlike diacerein, losing weight doesn’t come with diarrhea or liver risks.
What are the real risks of diacerein?
Diacerein isn’t harmless. The most common side effect is diarrhea-sometimes severe enough that people stop taking it. About 1 in 5 users quit because of gut issues.
There’s also a small risk of liver problems. In rare cases, diacerein has been linked to elevated liver enzymes and even hepatitis. That’s why doctors usually check liver function before and after starting treatment. If you’re already on other meds that affect your liver-like statins or certain antibiotics-your doctor will be extra cautious.
It’s also not safe during pregnancy or if you have inflammatory bowel disease. And it takes weeks to work. Most people don’t feel better until after 4-6 weeks, and full effects can take 3-6 months. That’s not something you can rush.
Who should consider diacerein?
Diacerein isn’t for everyone. But it might make sense if:
- You have moderate to severe osteoarthritis and haven’t responded to acetaminophen or physical therapy
- You can’t take NSAIDs because of stomach ulcers, kidney issues, or high blood pressure
- You’re looking for a treatment that might slow joint damage, not just mask pain
- You’re willing to wait months for results and can tolerate mild digestive side effects
If you’re hoping for quick pain relief or weight loss, diacerein won’t deliver. But if you’re in it for the long haul and want to protect your joints, it’s worth discussing with your doctor.
What should you do instead?
Instead of chasing diacerein for weight loss, focus on what actually works:
- Strength training for your legs-quads and hamstrings support your knees
- Low-impact cardio like swimming or cycling to burn calories without pounding joints
- Protein-rich meals to keep muscle mass while losing fat
- Walking 10,000 steps a day-studies show this reduces osteoarthritis pain as much as some medications
Even small changes add up. A 2023 trial from the University of Sydney found that overweight adults with knee osteoarthritis who lost just 8% of their body weight over 6 months cut their pain by 50% and improved mobility by 35%. No pills needed.
Final thoughts: Diacerein isn’t a weight loss drug
Diacerein is a slow-acting, joint-protecting medicine for osteoarthritis. It’s not designed for weight loss, and it shouldn’t be used as one. Any weight loss that happens is a side effect-not a benefit-and it’s not worth the risk.
If you’re dealing with joint pain and extra weight, the best strategy is simple: lose weight safely, move more, and strengthen your muscles. Those steps do more for your joints than any supplement or prescription ever could.
If your doctor suggests diacerein, ask them why-what’s the goal? Pain relief? Slowing damage? Or something else? Make sure you’re not mixing up side effects with benefits.
Can diacerein help me lose weight?
No, diacerein is not a weight loss drug. Some people lose a small amount of weight because it causes diarrhea as a side effect, but this is temporary and not healthy. It doesn’t burn fat, suppress appetite, or change metabolism. Any weight loss is accidental and not a reason to take it.
How long does it take for diacerein to work on joint pain?
It takes time. Most people start noticing less pain after 4 to 6 weeks, but it can take up to 3 to 6 months to feel the full benefit. Unlike painkillers that work in hours, diacerein works slowly to reduce inflammation and protect cartilage over time.
Is diacerein better than glucosamine for osteoarthritis?
Diacerein has stronger evidence for slowing joint damage than glucosamine. Glucosamine may help with mild pain for some people, but large reviews show its effects are small and inconsistent. Diacerein has been shown in multiple studies to reduce joint space narrowing on X-rays, which glucosamine hasn’t reliably done.
Can I take diacerein with other pain medications?
Yes, but only under medical supervision. Diacerein is often used alongside acetaminophen or low-dose NSAIDs if pain is still present. But combining it with other drugs that affect the liver or gut-like statins, antibiotics, or alcohol-can increase side effects. Always tell your doctor what else you’re taking.
Why isn’t diacerein available in the U.S.?
The FDA hasn’t approved diacerein because early trials showed inconsistent results and safety concerns, especially around liver function and gastrointestinal side effects. While it’s widely used elsewhere, U.S. regulators wanted stronger proof of benefit versus risk. Some doctors may prescribe it off-label, but it’s not commonly available in pharmacies.
If you’re considering diacerein, talk to your doctor-not a supplement store or online forum. It’s not a miracle cure, but for the right person, it can be a useful tool. Just don’t expect it to help you lose weight. Focus on movement, nutrition, and strength. That’s where real joint relief comes from.
