Your body clears uric acid mainly through the kidneys, which handle roughly two-thirds of the job, and through the gut, which takes care of the rest. When that system falls behind, uric acid builds up in the blood, and crystals can form in joints and soft tissue. Lowering uric acid comes down to reducing how much your body makes, increasing how much it excretes, or both. The tools range from drinking more water and changing what you eat to prescription drugs that dramatically cut production or force the kidneys to dump more uric acid into the urine.
How Your Kidneys Handle Uric Acid
Uric acid is the final breakdown product of purines, molecules your body uses to build DNA and fuel cells. An enzyme called xanthine oxidase catalyzes the last step of that breakdown, converting compounds called hypoxanthine and xanthine into uric acid.1American Journal of Physiology-Endocrinology and Metabolism. New insights into purine metabolism in metabolic diseases: role of xanthine oxidoreductase activity Once uric acid enters the bloodstream, the kidneys filter it and then perform a complicated balancing act: they reabsorb most of it back into the blood and secrete a fraction into the urine.
Several transport proteins on the surface of kidney cells manage this process. URAT1, sitting on the inner-facing membrane of the kidney’s proximal tubule, is the main transporter pulling uric acid back into the body. GLUT9, on the opposite side of the same cells, moves reabsorbed uric acid into the bloodstream.2Kidney Research and Clinical Practice. Role of urate transporters in the kidneys and intestine in uric acid homeostasis Experiments have shown GLUT9 actually contributes more to reabsorption than URAT1, and the two have additive effects.3American Journal of Physiology-Renal Physiology. SGLT2 inhibition and renal urate excretion: role of luminal glucose, GLUT9, and URAT1 On the secretion side, other transporters like OAT1 and OAT3 bring uric acid from the blood into kidney cells, while ABCG2 pushes it out into the urine.2Kidney Research and Clinical Practice. Role of urate transporters in the kidneys and intestine in uric acid homeostasis The net result of all this back-and-forth is that only about 10% of the filtered uric acid actually leaves in your urine.
The Gut’s Underappreciated Role
The remaining third of uric acid disposal happens in the intestines, a pathway researchers have only recently started to appreciate. The same ABCG2 transporter that works in the kidneys also operates in the intestinal lining, pumping uric acid into the gut lumen where bacteria can break it down further.2Kidney Research and Clinical Practice. Role of urate transporters in the kidneys and intestine in uric acid homeostasis Certain gut microbes metabolize purines and uric acid directly, and the composition of the gut microbiome appears to influence how efficiently this intestinal clearance works.4PubMed Central. Interactions between serum uric acid and gut microbiota: implications for metabolic health
The relationship runs both ways. When uric acid levels climb too high, microbial diversity in the gut drops, short-chain fatty acid production falls, and the intestinal barrier weakens.4PubMed Central. Interactions between serum uric acid and gut microbiota: implications for metabolic health That creates a vicious cycle: high uric acid damages the very microbial community that helps clear it. Animal studies have shown that restoring a healthier balance of gut bacteria can increase intestinal ABCG2 expression and improve uric acid excretion, though this research is still in its early stages in humans.5PubMed. Rosmarinic acid attenuates hyperuricemia via restoring hyperuricemia-induced renal and intestinal dysfunctions
Why Humans Are Especially Prone to High Uric Acid
Most mammals have an enzyme called uricase that breaks uric acid down into a far more soluble compound called allantoin, which the kidneys easily flush out. Humans, along with other great apes, lost a functional uricase gene millions of years ago through multiple independent mutations.6PubMed Central. Evolutionary history and metabolic insights of ancient mammalian uricases Without uricase, our blood uric acid levels sit much higher than those of mice, rats, and most other mammals.
To compensate, the human version of URAT1 evolved to be a high-affinity transporter, grabbing onto uric acid tightly but at a lower overall capacity than the rat or mouse version. Human URAT1 has roughly seven times the affinity for uric acid compared with the rat version, but only about a ninth of the transport capacity.7Molecular Biology and Evolution. Coevolution of URAT1 and Uricase during Primate Evolution: Implications for Serum Urate Homeostasis and Gout The practical consequence is that the human kidney reclaims uric acid efficiently at low levels but saturates more easily when levels spike. This evolutionary setup means we are, in a sense, built to run close to the edge of uric acid overload.
Foods and Drinks That Push Uric Acid Up
Diet contributes to roughly a third of the purine load your body processes, with the rest coming from normal cell turnover. A large analysis of national health data in the United States found that serum uric acid rose progressively with greater intake of meat and seafood, while dairy intake was associated with lower levels.8Arthritis & Rheumatism. Intake of purine‐rich foods, protein, and dairy products and relationship to serum levels of uric acid: The Third National Health and Nutrition Examination Survey The differences were modest per person but real at the population level, with the highest meat consumers averaging about half a mg/dL higher in serum uric acid than the lowest consumers.
Alcohol is a double hit. Beer and spirits contain purines that feed uric acid production, and the lactic acid generated during alcohol metabolism interferes with the kidneys’ ability to excrete uric acid.9PubMed Central. Impact of alcohol consumption on hyperuricemia and gout: a systematic review and meta-analysis Ethanol also speeds up the breakdown of energy-carrying molecules called adenine nucleotides, which pours more purine building blocks into the uric acid pipeline.10PubMed. Effect of ethanol on metabolism of purine bases (hypoxanthine, xanthine, and uric acid) Beer tends to be the worst offender because it combines alcohol’s metabolic effects with a heavy purine load from the brewing process.
Fructose deserves its own mention. Unlike other sugars, fructose metabolism in the liver rapidly depletes a cellular energy molecule called ATP, generating a burst of purines that get converted straight to uric acid. Sugar-sweetened beverages are a significant source of fructose for many people, and research has linked high fructose intake to insulin resistance, metabolic syndrome, and sustained elevations in uric acid.11PubMed Central. Fructose and Uric Acid: Major Mediators of Cardiovascular Disease Risk Starting at Pediatric Age
Diet and Lifestyle Strategies That Help
If certain foods raise uric acid, the obvious question is whether other foods or habits bring it down. Several do, though their effects tend to be moderate compared with medication.
Dairy products consistently show an inverse relationship with serum uric acid. In the same national data set that linked meat to higher levels, people with the highest dairy intake had levels about 0.21 mg/dL lower than those who ate the least dairy.8Arthritis & Rheumatism. Intake of purine‐rich foods, protein, and dairy products and relationship to serum levels of uric acid: The Third National Health and Nutrition Examination Survey The likely mechanism involves certain milk proteins that increase uric acid excretion in the kidneys.
Tart cherry juice has attracted attention after small clinical trials found meaningful drops in uric acid. In one study of overweight and obese adults, drinking tart cherry juice daily for four weeks reduced plasma uric acid by about 19%, while the placebo group saw no change.12PubMed Central. Consumption of 100% Tart Cherry Juice Reduces Serum Urate in Overweight and Obese Adults That is an encouraging result for a food-based intervention, though the trial was small and the long-term effects are unclear.
Moderate-intensity exercise appears to lower uric acid, at least in people who are overweight. A study in adults with obesity found that moderate-intensity physical activity was independently associated with lower uric acid levels, even after accounting for age, body weight, and alcohol use. Light and vigorous activity did not show the same association.13Internal Medicine. Influence of Physical Activity Intensity and Aerobic Fitness on the Anthropometric Index and Serum Uric Acid Concentration in People with Obesity Very intense exercise can actually raise uric acid temporarily by breaking down muscle ATP, so the sweet spot seems to be sustained, moderate effort like brisk walking, swimming, or cycling.
Why Drinking More Water Matters
Hydration is one of the simplest levers for uric acid clearance. Higher urine flow means more uric acid leaves the body, and the mechanism appears to be an actual increase in how much the kidney tubules secrete, not just dilution of what is already in the urine.14Arthritis & Rheumatism. Effect of urine flow rate on uric acid excretion in man
A large cross-sectional analysis of U.S. adults using national health survey data found a clear negative correlation between water intake per kilogram of body weight and serum uric acid. The relationship followed an L-shaped curve, meaning the biggest drops in uric acid came from moving from low to moderate water intake. Beyond a certain point, additional water produced smaller returns.15PubMed Central. Quantity-effect correlation between water intake and serum uric acid in US adults: a cross-sectional study based on NHANES data The correlation was stronger in women than in men. A meta-analysis also found that higher water intake significantly reduced the relative supersaturation of uric acid in the urine, which is the key factor in whether uric acid crystallizes into kidney stones.16Journal of Clinical Nephrology. High water intake in preventing the risk of Uric Acid Nephrolithiasis: A systematic review and meta-analysis
The practical takeaway is straightforward: staying well-hydrated helps, and people who currently drink little water stand to benefit the most. You do not need to force extreme quantities; the biggest gains come from reaching a moderate, consistent intake.
Making Urine Less Acidic
Uric acid has a quirk that matters for kidney stone prevention. In acidic urine, it exists in its undissociated form, which is poorly soluble and crystallizes easily. When urine pH rises above about 6.0, uric acid loses a proton and becomes urate, which dissolves much more readily. That is why doctors prescribe potassium citrate to people prone to uric acid kidney stones: it raises urine pH into the 6.0–6.5 range, keeping uric acid in its soluble form.17PubMed Central. Uric Acid Nephrolithiasis: A Systemic Metabolic Disorder
Both potassium citrate and sodium citrate raise urine pH effectively and have been shown to increase it from around 5.35 to roughly 6.7 in clinical studies.18PubMed. Contrasting effects of potassium citrate and sodium citrate therapies on urinary chemistries and crystallization of stone-forming salts Potassium citrate is generally preferred because it avoids the extra sodium load. This approach can even dissolve existing uric acid kidney stones over time, as long as the stones are not blocking the urinary tract.19PubMed. Dissolution of radiolucent renal stones by oral alkalinization with potassium citrate/potassium bicarbonate Alkalinization does not lower blood uric acid levels directly, but it prevents one of the worst consequences of having too much uric acid in the urine.
Medications That Cut Uric Acid Production
When lifestyle changes are not enough, medications become the main tool. The most widely used class targets the enzyme xanthine oxidase, which catalyzes the final step in uric acid production. By blocking this enzyme, these drugs reduce the total amount of uric acid the body generates.
Allopurinol has been the standard choice for decades. Febuxostat, a newer alternative, works on the same enzyme through a different binding mechanism. Both have been shown in large long-term trials to be effective and generally well tolerated.20PubMed Central. Clinical Effects of Xanthine Oxidase Inhibitors in Hyperuricemic Patients In a head-to-head trial of patients with heart failure and high uric acid, both drugs brought levels down from around 8.6 mg/dL to about 5.1 mg/dL over three years.21PubMed Central. Comparison between febuxostat and allopurinol uric acid-lowering therapy in patients with chronic heart failure and hyperuricemia: a multicenter randomized controlled trial Beyond just lowering uric acid, these drugs also reduce the reactive oxygen species that xanthine oxidase generates as a byproduct, which may confer additional benefits for the heart and kidneys.22PubMed Central. Hyperuricemia-Related Diseases and Xanthine Oxidoreductase (XOR) Inhibitors: An Overview
Allopurinol is typically started at a low dose and gradually increased. Febuxostat tends to be reserved for people who cannot tolerate allopurinol or whose kidney function makes dosing tricky. Both require monitoring, and there has been ongoing debate about febuxostat’s cardiovascular safety profile, though the evidence has evolved over time.
Medications That Boost Kidney Excretion
A second approach to lowering uric acid is to make the kidneys dump more of it. Uricosuric drugs do this by blocking the URAT1 transporter, the protein responsible for pulling uric acid back from the urine into the bloodstream. Since URAT1 handles roughly 90% of uric acid reabsorption in the kidney, blocking it produces a substantial increase in urinary uric acid output.23PubMed Central. A Brief Review of Natural Products with Urate Transporter 1 Inhibition for the Treatment of Hyperuricemia
Probenecid is the classic uricosuric agent, though its use has declined because it requires multiple daily doses and interacts with many other drugs. Lesinurad, which targets both URAT1 and another transporter, was available for a while but has been withdrawn in some markets. Newer agents like dotinurad have been developed to more selectively inhibit URAT1 while sparing other transporters, reducing off-target effects.24PubMed. Unique Binding Sites of Uricosuric Agent Dotinurad for Selective Inhibition of Renal Uric Acid Reabsorptive Transporter URAT1
Anyone taking a uricosuric drug needs to stay well-hydrated and may need urinary alkalinization to prevent the surge of uric acid in the urine from forming kidney stones. This is the practical tension with this drug class: they solve one problem (high blood uric acid) by moving the problem downstream (high urinary uric acid), and that requires management of its own.
Pegloticase for Severe, Treatment-Resistant Gout
For people who have failed other therapies, there is a more aggressive option. Pegloticase is a recombinant version of the uricase enzyme that humans lost millions of years ago. Given as an intravenous infusion, it converts uric acid into allantoin, which the kidneys readily excrete.25PubMed Central. Critical appraisal of the role of pegloticase in the management of gout The drug can produce dramatic drops in serum uric acid within hours, and it is sometimes used to shrink large uric acid deposits called tophi in patients with severe gout.
Pegloticase is not a first-line treatment. It carries a risk of infusion reactions and can lose effectiveness over time as the immune system develops antibodies against it. But for the relatively small group of patients whose gout does not respond to standard medications, it represents a fundamentally different biological approach to the problem.
Common Drugs That Quietly Affect Uric Acid
Your uric acid levels may be shaped by medications you take for entirely unrelated conditions. Diuretics, among the most commonly prescribed drugs for blood pressure and heart failure, raise uric acid by increasing its reabsorption in the kidneys. This effect kicks in even at low doses and gets worse as the dose climbs.26PubMed. Cardiovascular drugs and serum uric acid Beta-blockers also tend to raise levels. Low-dose aspirin, widely used for heart protection, has a mild uric-acid-raising effect as well.27PubMed Central. Lowering and Raising Serum Urate Levels: Off-Label Effects of Commonly Used Medications
On the flip side, certain blood pressure drugs lower uric acid as an unintended bonus. The angiotensin II receptor blocker losartan mildly increases uric acid excretion in the urine and brings blood levels down. Some ACE inhibitors like captopril, enalapril, and ramipril do the same, and at sufficient doses they can offset the uric acid increase caused by a diuretic taken alongside them.26PubMed. Cardiovascular drugs and serum uric acid If you have gout and hypertension, these secondary effects can influence which blood pressure medication makes the most sense for you, and it is worth discussing with your doctor.
What Counts as “Too High” and When Treatment Starts
Uric acid crystallizes into monosodium urate at concentrations above about 6.8 mg/dL under normal body conditions. All major rheumatology societies recommend a treatment target below 6 mg/dL, and some suggest below 5 mg/dL for patients with severe gout, because both levels sit safely below the crystallization point.28PubMed. Critical appraisal of serum urate targets in the management of gout The goal is to stop new crystals from forming and to slowly dissolve the ones that already exist.29PubMed. Overview of Serum Uric Acid Treatment Targets in Gout: Why Less Than 6 mg/dL?
A trickier question is what to do when uric acid is high but there have been no gout attacks. The American College of Rheumatology currently recommends against starting medication for this so-called asymptomatic hyperuricemia in most people. Their reasoning: among those with high uric acid but no symptoms, even levels above 9 mg/dL, only about 20% develop gout within five years. You would need to treat 24 people with medication for three years to prevent a single first gout attack.30PubMed Central. 2020 American College of Rheumatology Guideline for the Management of Gout The panel concluded that for most people in this situation, the costs and risks of long-term medication outweigh the relatively small chance of developing symptoms.
Not everyone agrees. Japanese guidelines take a more aggressive stance, recommending medication for asymptomatic hyperuricemia when chronic kidney disease is present, based on concerns that uric acid itself contributes to kidney and cardiovascular damage over time.31Circulation Journal. Uric Acid as a Risk Factor for Chronic Kidney Disease and Cardiovascular Disease ― Japanese Guideline on the Management of Asymptomatic Hyperuricemia ― Serum uric acid is independently associated with hypertension, insulin resistance, and features of metabolic syndrome, which makes the argument that it should be treated earlier seem reasonable on its face.32Circulation Journal. Relationship Between Serum Uric Acid Concentration and Insulin Resistance and Metabolic Syndrome Whether lowering it actually prevents those conditions, rather than just being correlated with them, is still an open question that ongoing trials are trying to answer.
The Flare Paradox When Starting Treatment
One of the most frustrating aspects of gout management is that starting uric acid-lowering medication can temporarily trigger the very attacks it is meant to prevent. When blood uric acid drops quickly, existing crystal deposits in the joints destabilize, shedding fragments that provoke an inflammatory flare. This is not a sign that the medication is not working; it is actually evidence that stored crystals are dissolving.
This paradox creates real problems. Patients who experience a flare shortly after starting treatment sometimes stop taking the medication, assuming it made things worse. Doctors typically prescribe a low-dose anti-inflammatory alongside the uric acid-lowering drug for the first several months to blunt these mobilization flares. The standard approach is to start at a low dose and increase gradually, giving the body time to clear crystal deposits without triggering a massive inflammatory response. After the first six to twelve months, flare frequency usually drops as the crystal burden diminishes.