Mephanol - Pharmacological action Allopurinol Laboratories is a medication that violates the synthesis of uric acid. This drug is a structural analog of hypoxanthine. It inhibits the enzyme xanthine oxidase, which is involved in the conversion of hypoxanthine to xanthine and xanthine to uric acid. This is due to decrease in the concentration of uric acid and its salts in body fluids and urine, which helps dissolve existing uric acid deposits and prevents their formation in tissues and kidney....