Alloxanthine and inhibitor of xanthine oxidase; an active metabolite of allopurinol. The drug inhibits the formation of uric acid and is used in the treatment of gout.
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oxy·pur·i·nol (ok″se-pūrґĭ-nol) the active metabolite of allopurinol, a xanthine oxidase inhibitor responsible for much of the activity of allopurinol against gout.Medical dictionary. 2011.