Nephrolithiasis Treatment Guidelines

Acute Management

NSAIDs (diclofenac, ibuprofen, or metamizole) are first-line therapy for renal colic, as they reduce the need for additional analgesia compared to opioids, and should be used at the lowest effective dose due to cardiovascular and gastrointestinal risks 1
Opioids (hydromorphine, pentazocine, or tramadol—but not pethidine) serve as second-line agents when NSAIDs are contraindicated or insufficient 1
Urgent decompression via percutaneous nephrostomy or ureteral stenting is mandatory for sepsis and/or anuria in an obstructed kidney, and antibiotics should be administered immediately and adjusted based on culture results 1
Alpha-blockers are strongly recommended for ureteral stones >5 mm in the distal ureter in patients suitable for conservative management 1

The European Association of Urology recommends increasing fluid intake to achieve at least 2 liters of urine output daily for patients with calcium oxalate/phosphate stones 2
The American Urological Association suggests maintaining normal dietary calcium intake of 1,000-1,200 mg/day, rather than restricting it, for patients with calcium oxalate/phosphate stones 2
Potassium citrate is first-line therapy to raise urine pH to 6.0 for patients with uric acid stones, and most patients have low urinary pH rather than hyperuricosuria as the predominant risk factor 2
For patients with cystine stones, a stepwise approach includes increased fluid intake, sodium and protein restriction, and urinary alkalinization with potassium citrate to achieve urine pH of 7.0 2
The European Association of Urology recommends oral chemolysis with alkalinization (citrate or sodium bicarbonate to pH 7.0-7.2) to dissolve existing uric acid stones 1

Obtain 24-hour urine collection within 6 months of treatment initiation to assess response to dietary/medical therapy, and measure volume, pH, calcium, oxalate, uric acid, citrate, sodium, potassium, and creatinine 2
Continue annual 24-hour urine collections to assess adherence and metabolic response 2
Obtain periodic blood testing to assess for adverse effects in patients on pharmacologic therapy, including hypokalemia and glucose intolerance (thiazides), elevated liver enzymes (allopurinol, tiopronin), anemia (acetohydroxamic acid, tiopronin), and hyperkalemia (potassium citrate) 2
Perform stone analysis for all first-time stone formers, and obtain repeat stone analysis in patients not responding to treatment, as stone composition may change 1

The American College of Physicians recommends increasing fluid intake to achieve at least 2 liters of urine output daily for patients with calcium stones, as suggested by Hounsfield units (>448 HU) 3, 4
The American College of Physicians suggests thiazide diuretics, such as hydrochlorothiazide 50 mg or chlorthalidone 25-50 mg, for hypercalciuria in patients with calcium stones, as indicated by Hounsfield units (>448 HU) 3
Monotherapy is as effective as combination therapy and should be preferred to minimize adverse effects, according to the American College of Physicians, for patients with calcium stones, as suggested by Hounsfield units (>448 HU) 3
The evidence does not support using HU values alone to guide medical management without metabolic evaluation, as stated by the American College of Physicians 5, 3
Randomized controlled trial evidence supporting biochemistry-tailored treatment over empirical treatment is limited, and most trials included only calcium stone formers, according to the American College of Physicians 5, 3, 4