Allopurinol reduces the production of uric acid in your body. Uric acid buildup can lead to gout or kidney stones. Allopurinol is used to treat gout or kidney stones, and to decrease levels of uric acid in people who are receiving cancer treatment. Allopurinol oral tablet is available as a generic drug and as brand-name drugs. Brand names: Zyloprim and Lopurin. Allopurinol is also given as an injection by a healthcare provider in the. Uses. This medication is a combination of 2 ingredients: lesinurad and allopurinol. It works by decreasing the amount of uric acid your body makes, and by helping the kidneys get rid of uric acid. SIDE EFFECTS. Data upon which the following estimates of incidence of adverse reactions are made are derived from experiences reported in the literature, unpublished clinical trials and voluntary reports since marketing of ZYLOPRIM (allopurinol) began. Allopurinol is a Prescription Drug used to treat kidney stones and gout and to decrease levels of uric acid in people who are receiving cancer treatment. Allopurinol has the following structural formula below: Allopurinol is known chemically as 1,5-dihydro-4 H-pyrazolo [3,4-d]pyrimidin-4-one. It is a xanthine oxidase inhibitor which is administered orally. Consumer information about the medication ALLOPURINOL - ORAL (Zyloprim), includes side effects, drug interactions, recommended dosages, and storage information. Read more about the prescription drug ALLOPURINOL - ORAL. Allopurinol is used for the long-term treatment and prevention of gout. Taken regularly, it can stop attacks of gout and help prevent damage to the joints. Both Allopurinol and febuxostat are uric acid lowering agents and work in a similar way. So, using both the two medicines together may not be very beneficial and can increase the risk of side effects. Uses. Allopurinol is used to treat gout and certain types of kidney stones. It is also used to prevent increased uric acid levels in patients receiving cancer chemotherapy.