Question:
Laxative abuse causes which of the following renal stones?
Laxative abuse causes which of the following renal stones?
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Potassium loss from laxatives raises renal ammonium, favouring an unusual urate stone.
Updated On: Jun 24, 2026
- Uric acid
- Ammonium urate
- Struvite
- Calcium oxalate
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The Correct Option is B
Solution and Explanation
Step 1: Most kidney stones are calcium oxalate, with uric acid, struvite (infection stones) and cystine being less common. Step 2: Chronic laxative abuse causes ongoing potassium and fluid loss through the gut. Step 3: To compensate for the resulting hypokalaemia and acid-base shifts, the kidney increases ammonium production, which favours formation of the uncommon ammonium acid urate (ammonium urate) stone. Step 4: Therefore the stone specifically linked to laxative abuse is ammonium urate, not the more general calcium oxalate, uric acid or infection-related struvite stones.
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