Clinical recommendation	Evidence rating	References	Comments
Physicians should advise patients to increase their water intake to reduce the risk of recurrence of urinary calculi and to prolong the average interval of recurrence.	B	11,12	Findings from one prospective trial and usual clinical practice
Physicians should advise patients to limit their intake of sodium and animal protein to reduce the risk of developing urinary calculi.	A	13–15	Supported by prospective trials and large population studies
Potassium citrate (Urocit-K) should be administered to decrease the risk of developing calcium oxalate stones.	B	19	Findings from one randomized trial and usual clinical practice