Urinary Excretion and Renal Clearance of Allopurinol in Male Gout Patients

Drugs removed from the body either without changing from its original form or in the form of its metabolite. Allopurinol drug decreases uric acid level in blood and it is used for the treatment of gout and tumor lysis syndrome. Allopurinol and its active metabolite oxipurinol stop the function of xanthine oxidase which forms uric acid from xanthine and hypoxanthine. In this study a quantitative assay using high-performance liquid chromatography (HPLC) with UV-detection was used as a method for quantification of allopurinol and oxipurinol in human serum and urine samples of gout patients after allopurinol administration. The urinary excretion and renal clearance was determined in male gout patients. Blood and urine samples of the human male patients of gout (n=10) after the oral administration of 300mg drug were taken at different time intervals. Results of this study show that there is slow metabolism of allopurinol inside body due to its extensive bonding with blood proteins. Statistical analysis was performed by expressing all the data as mean and ± standard error of mean. The effect of pH and diuresis on renal clearance of allopurinol was studied by regression analysis.