title: Placebo versus allopurinol for recurrent urinary calculi.
mesh_terms: D000493:Allopurinol / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D006801:Humans; D006863:Hydrogen-Ion Concentration; D014527:Uric Acid / Q000652:urine; D014545:Urinary Calculi / Q000188:drug therapy* / Q000652:urine
chemical_list: D014527:Uric Acid; D000493:Allopurinol