[Therapy with alllopurinol and benzbromarone, single and combined. Renal elimination of lithogenous and colloid protective substances (author's transl)].

12 hyperuremic male patients got during two comparative tests for 16 days 300 mg/die Allopurinol or 100 mg/die Benzbromarone or a combination of 100 mg Allopurinol with 20 mg Benzbromarone. During this time the renal elimination of uric acid, sodium, calcium, magnesium and citrate war measured and the renal clearance of uric acid, creatinine and sodium was determinated. Without any therapy the combination of 100 mg Allopurinol with 20 mg Benzbromarone per die reduces the elimination of uric acid significantly under the original value in the 24-hour-urine. The elimination of the uric acid increases with 300 mg/die Allopurinol. The clearance ratio of uric acid and creatinine rises 33% to 60%. With 100 mg/die Benzbromarone this value goes up to 233% compared with the results without therapy. At the same time the therapy with Brenzbromarone makes the clearance ratio of uric acid to sodium rise significantly to 257%. Under the 3 types of therapy there is no significant change in the 24-hours-urine of the clearance of creatinine and sodium, the clearance ratio of sodium to creatinine and the elimination ratio of sodium, calcium, magnesium and citrate. Hyperuremic patients with urolithic diathesis need Allopurinol therapy without any combination.