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We report for the first time the lack of therapeutic effects after the switch from a brand formulation of allopurinol to a generic one. A 56-year-old man, with a 5 years history of well-treated gout arthropathy with allopurinol (Zyloric ® 300 mg/die), developed acute gout arthropathy after the switch from the brand formulation of allopurinol to a generic one. Clinical evaluation and laboratory...
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