Medical management of renal stones

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urolithiasis AND medical therapy

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EAU Guidelines Urolithiasis 2026 medical expulsive therapy prevention

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

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Medical management of renal stones

Management has two goals:

Treat the acute stone episode: relieve pain, identify infection or obstruction, and help a suitable ureteric stone pass.
Prevent recurrence: determine stone type and urinary risk factors, then use dietary and drug therapy targeted to those findings.

1. Acute renal colic

Analgesia

NSAIDs are first line, if renal function and gastrointestinal risk allow, for example diclofenac, ibuprofen, or ketorolac. They relieve ureteric inflammation and pain and generally work better than opioids for renal colic.
Paracetamol is another option.
Use an opioid only as rescue therapy when pain remains uncontrolled or NSAIDs are contraindicated.
Do not force large volumes of IV or oral fluid during severe colic. Maintain normal hydration, but forced fluids do not push out an obstructing stone and may worsen pain.

The current EAU renal-colic guidance recommends NSAIDs or paracetamol first, reserving opioids for second line treatment.

Antiemetics

Use when vomiting prevents oral intake, for example ondansetron or metoclopramide, selected according to patient factors.

2. Medical expulsive therapy

For a small uncomplicated ureteric stone, especially a distal ureteric stone larger than 5 mm, observation with an alpha-blocker can increase the probability of passage.

Tamsulosin 0.4 mg once daily is commonly used.
Alternatives include other alpha-blockers such as silodosin, depending on local practice.
Counsel about dizziness, postural hypotension, fatigue, and ejaculatory dysfunction.
This is not appropriate for everyone, and alpha-blockers are considered off-label for this indication in some jurisdictions.

The greatest benefit is for distal stones >5 mm, not small renal calyceal stones. The EAU guidance on MET gives a strong recommendation to offer an alpha-blocker in this situation.

3. Infection and obstructed kidney

Obtain urinalysis and urine culture if UTI is suspected.
Give culture-directed antibiotics for infection.
Antibiotics alone are inadequate if there is an infected obstructed collecting system.

Urgent urological drainage with a ureteric stent or percutaneous nephrostomy is required for obstruction with:

Fever, rigors, sepsis, or pyuria
Acute kidney injury, anuria, or a solitary functioning kidney
Bilateral obstruction
Uncontrolled pain or persistent vomiting

This is a urological emergency. Definitive stone treatment follows once sepsis is controlled.

4. Dissolution therapy

Most calcium stones do not dissolve with medication. Medical dissolution is mainly useful for uric acid stones.

Stone type	Medical approach
Uric acid	Urinary alkalinisation with potassium citrate is preferred. The usual aim is urine pH about 6.0 to 6.5 for prevention and may be higher under specialist monitoring for dissolution. Avoid excessive alkalinisation because it can promote calcium phosphate stones.
Cystine	Very high fluid intake, sodium restriction, and potassium citrate to alkalinise urine. If these fail, specialist treatment with a thiol-binding drug such as tiopronin or penicillamine may be needed.
Struvite/infection stone	Culture-directed antibiotics help suppress infection and slow further growth, but complete stone clearance is generally needed.
Calcium oxalate/calcium phosphate	No reliable dissolution therapy. Focus on recurrence prevention.

For uric acid stones, the EAU metabolic guidance strongly recommends alkaline citrate; add allopurinol when hyperuricosuria is present.

Prevention of recurrent stones

Send a passed or removed stone for composition analysis. In recurrent, bilateral, young-onset, familial, cystine, uric acid, infection, or high-risk stone disease, undertake metabolic evaluation, often including serum studies and one or two 24-hour urine collections.

Measures for almost all stone formers

Increase fluid intake to produce at least 2 to 2.5 L urine/day.
Reduce dietary sodium, generally aiming below about 2 g sodium/day.
Maintain normal dietary calcium intake with meals. Do not routinely prescribe a low-calcium diet, as this may increase intestinal oxalate absorption.
Moderate animal protein intake.
Avoid excessive high-oxalate foods if hyperoxaluria is present, especially spinach, rhubarb, nuts, and high-dose vitamin C supplements.
Maintain healthy weight and dietary fruit and vegetable intake where appropriate.

Targeted drug prevention

Metabolic finding or stone type	Usual treatment
Hypercalciuria with recurrent calcium stones	A thiazide or thiazide-like diuretic, with sodium restriction. Monitor potassium, sodium, glucose, uric acid, blood pressure, and renal function.
Hypocitraturia or recurrent calcium stones with low citrate	Potassium citrate. Monitor serum potassium and urine pH, especially in CKD or when using ACE inhibitors, ARBs, or potassium-sparing drugs.
Hyperuricosuric calcium oxalate stones with normal urinary calcium	Lower purine intake and consider allopurinol.
Uric acid stones	Potassium citrate for urine alkalinisation; allopurinol if hyperuricosuria or gout-related urate overproduction persists.
Cystinuria	High urine volume, urinary alkalinisation, low sodium intake, then tiopronin or penicillamine through a specialist if needed.
Struvite stones	Complete stone removal plus infection control; suppressive antibiotics may be used in selected residual or recurrent disease under urology supervision.

A key point: treatment should be based on stone composition and 24-hour urine abnormalities, rather than giving the same drugs to every patient. The 2026 EAU urolithiasis guideline update includes updated recommendations for medical expulsive therapy, renal colic, and pharmacological prevention.

Seek urgent care now for fever with flank pain, reduced or absent urine output, a single kidney, pregnancy with significant pain, persistent vomiting, or pain not controlled with prescribed medication.

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