SPL Set ID: e453a5e0-44c3-4eb5-a8d0-7c02157d2f8c

Allopurinol, USP is a xanthine oxidase inhibitor. It has the following structural formula: Molecular Formula: C 5 H 4 N 4 O Allopurinol is known chemically as 1, 5-dihydro-4 H -pyrazolo [3, 4- d ] pyrimidin-4-one and it has a molecular weight of 136.11 g/mol. It is slightly soluble in sodium hydroxide and potassium hydroxide solution, very slightly soluble in water and alcohol, practically insoluble in chloroform and ether. It is a xanthine oxidase inhibitor which is administered orally. Each functionally scored white to off-white round tablet contains 100 mg or 300 mg of allopurinol USP and the inactive ingredients crospovidone, lactose monohydrate, magnesium stearate, corn starch and povidone.