what is allopurinol therapy
Last reviewed on RxList 5/6/2015. Zyloprim (allopurinol) is a xanthine oxidase inhibitor that reduces the production of uric acid. Zyloprim is used to prevent gout attacks by reducing uric acid production; high levels of uric acid may cause gout or kidney stones. Zyloprim is available as a generic termed allopurinol.