[Treatment of hypercalciuria found in urolithiasis patients].

To reduce urinary calcium excretion, 50 mg of hydrochlorothiazide per day was given to 35 patients with hypercalciuria. Urinary calcium decreased significantly after 4 weeks of drug administration, but urinary magnesium did not change. Magnesium calcium ratio increased significantly. Although serious side effects were not seen, serum potassium decreased and serum uric acid increased significantly. From these results thiazide seems to be a useful and safe medicine to reduce urinary calcium excretion. The dose and method of administration require further examination because the patients have to take the drug for a long time.