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Allopurinol inhibits xanthine oxidase, the enzyme that converts purines into uric acid. By reducing uric acid production, it lowers serum urate levels over time, which prevents urate crystals from forming in the joints and soft tissues that cause painful gout flares.

Allopurinol begins lowering uric acid levels within days, but meaningful reductions in flare frequency typically take several months of consistent use. Most guidelines recommend aiming for a serum uric acid level below 6 mg/dL, which can take 3 to 6 months to achieve at the right dose.

When uric acid levels drop rapidly, existing urate crystals can shift or partially dissolve, temporarily triggering joint inflammation. This is a well-recognized phenomenon. Physicians often co-prescribe a short course of colchicine or an anti-inflammatory during the first few months of allopurinol therapy to reduce this risk.

Allopurinol is typically started at a low dose, often 100 mg daily, and gradually increased every 2 to 4 weeks until the target uric acid level is reached. The usual maintenance dose ranges from 200 mg to 300 mg daily for mild gout, and up to 800 mg daily for more severe cases, adjusted based on kidney function.

Yes. Allopurinol significantly increases the toxicity of azathioprine and 6-mercaptopurine by inhibiting their metabolism, so this combination requires dose reduction or avoidance. It can also enhance the effects of warfarin and some other medications. Always inform your physician of all medications you are taking.

Even while on allopurinol, limiting high-purine foods such as organ meats, shellfish, and red meat, as well as alcohol (especially beer) and high-fructose beverages, can help improve uric acid control. Staying well hydrated also supports kidney excretion of uric acid.

Doctronic uses an AI-powered evaluation to gather your symptoms and medical history, which is then reviewed by a licensed physician. The physician determines whether a prescription refill is appropriate and provides a personalized treatment plan, all without requiring an in-person visit.

Yes. Doctronic connects patients with fully licensed physicians whose prescribing decisions are doctor-reviewed and audited for quality. The platform is HIPAA-compliant, and care is available to adults 18 and older in any U.S. state.