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Renal calculi medical treatment

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EAU Guidelines Urolithiasis medical expulsive therapy potassium citrate 2026

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kidney stones AND medical therapy

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https://uroweb.org/guidelines/urolithiasis/chapter/guideline…

Medical treatment of renal calculi

Medical management has two goals:
  1. Relieve an acute ureteric colic episode and help a ureteric stone pass
  2. Prevent recurrence, based on stone composition and metabolic evaluation
Most renal stones themselves do not dissolve. The main exception is a uric acid stone, which can often be dissolved by urine alkalinisation.

1. Acute symptomatic stone

  • Analgesia: An NSAID is usually first-line if kidney function and gastrointestinal risk permit. Avoid or use NSAIDs cautiously in acute kidney injury, dehydration, peptic ulcer disease, anticoagulant use, or advanced chronic kidney disease.
  • Antiemetic if nausea or vomiting is present.
  • Hydration: Maintain normal oral fluid intake. Do not force excessive fluids during severe colic, as it can worsen pain.
  • Medical expulsive therapy: An alpha-blocker such as tamsulosin may be offered for a distal ureteric stone, especially if it is 5-10 mm and conservative management is appropriate. It can cause dizziness and postural hypotension. The 2026 EAU guideline supports alpha-blockers as an option in this setting, though use for stone passage is off-label in many jurisdictions. EAU urolithiasis guidance
Medical expulsive therapy should be stopped and urgent urological assessment obtained if fever/infection, uncontrolled pain, falling kidney function, or persistent obstruction develops.

2. Stone-specific dissolution and prevention

Stone type / abnormalityMedical treatment
Calcium oxalate or calcium phosphate stoneIncrease fluid intake; reduce dietary sodium; maintain normal dietary calcium, rather than severe calcium restriction. Potassium citrate for hypocitraturia. A thiazide or thiazide-like diuretic may be used for recurrent calcium stones with hypercalciuria, together with a low-salt diet.
Uric acid stoneUrinary alkalinisation is the main treatment, generally with potassium citrate. This can dissolve uric acid stones. Sodium bicarbonate is an alternative but can increase sodium load and urinary calcium. Allopurinol may be used where hyperuricosuria or gout is present, but it does not replace alkalinisation.
Cystine stoneVery high fluid intake, reduced salt and animal-protein intake, and urinary alkalinisation with potassium citrate. If these fail, use a cystine-binding thiol drug, usually tiopronin.
Struvite / infection stoneAntibiotics are used for active infection, but complete stone removal is usually needed because bacteria can persist within the stone. Suppressive antibiotics alone are not definitive treatment.
Potassium citrate is preferred over sodium citrate in hypocitraturia because sodium can promote urinary calcium excretion. It requires monitoring for gastrointestinal intolerance and hyperkalaemia, particularly with chronic kidney disease or ACE inhibitor/ARB use. Comprehensive Clinical Nephrology, 7th ed., p. section Hypocitraturia; Campbell-Walsh Urology, section Alkali Agents.

3. General recurrence prevention

For most recurrent stone formers:
  • Aim for a urine volume of at least 2 to 2.5 L/day, typically requiring about 2.5-3 L fluid intake daily, adjusted for climate and losses.
  • Limit sodium, avoid excessive animal protein, and avoid high-dose vitamin C supplements.
  • Keep normal dietary calcium intake with meals. Very low calcium diets can increase intestinal oxalate absorption.
  • In calcium oxalate stone formers, reduce very high-oxalate foods if urinary oxalate is elevated, and consume calcium-containing food with oxalate-containing meals.
  • Obtain stone analysis when possible. Recurrent, bilateral, early-onset, or high-risk cases need serum tests and a 24-hour urine metabolic evaluation before selecting long-term drugs.

When this is an emergency

Seek urgent emergency/urology care for:
  • Fever, chills, or suspected urinary infection with obstruction
  • Persistent vomiting or inability to drink
  • Anuria, solitary kidney, pregnancy, or reduced renal function
  • Uncontrolled pain
  • A large, obstructing, or non-passing stone
An infected obstructed kidney requires urgent drainage plus antibiotics, not medical expulsive therapy alone. EAU emergency recommendations
For uric acid calculi, textbook evidence supports oral alkalinisation as the central dissolution treatment. Smith and Tanagho's General Urology, 19th ed., section Noncalcium calculi. For cystinuria, first-line therapy is hydration, dietary sodium/protein restriction, and potassium citrate; tiopronin is used when these measures do not control stone formation. Campbell-Walsh Urology, section Key Points: Cystinuria.
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