In this randomized double-blind study, patients receive allopurinol or a placebo for 3 months.
Dependent variables: 25(OH)-vitamin D, 1,25(OH)2D, FGF-23, PTH, calcium and phosphorus Population: stage 3, 4 or 5 CKD on conservative management at the Nephrology Service of Hospital das Clinicas HCFMUSP, Sao Paulo, Brazil.
The same physician will follow patients. Adverse effects will be recorded.
