Getting uric acid under 6.0 mg/dL for Gout: did starting Allopurinol low (100 mg) with a flare shield stop the 'crystal mobilization' attacks?
The first time a primary care clinic put me on Allopurinol, they started me straight at 300 mg with no prophylactic shield, and two weeks later I got the worst big-toe gout flare of my life—so I quit taking it, thinking Allopurinol 'caused' gout. A rheumatologist finally explained that when serum uric acid drops too fast, existing monosodium urate crystals in the joint start dissolving and shedding their protein coating, triggering a mobilization flare! This time we started at 100 mg for a month, stepped up to 200 mg, then 300 mg while taking low-dose daily colchicine for the first 12 weeks. My serum uric acid went from 8.6 mg/dL down to 5.1 mg/dL, and I haven't had a single flare in 9 months! What uric acid number does your doctor target?
2020 American College of Rheumatology (ACR) Gout Guidelines mandate a treat-to-target serum urate <6.0 mg/dL (<5.0 mg/dL for tophaceous gout), starting Allopurinol at ≤100 mg/day with concomitant flare prophylaxis (colchicine or NSAID) for the first 3–6 months of titration.