Febuxostat (Uloric--Takeda), a xanthine oxidase inhibitor, has been approved by the FDA for chronic management of hyperuricemia in patients with gout. It is the first drug marketed for treatment of gout in 40 years. Febuxostat is structurally unrelated to allopurinol, the only other commercially available inhibitor of xanthine oxidase. Xanthine oxidase inhibitors decrease serum urate concentrations by decreasing urate synthesis.