Medications That Cause Kidney Stones
Direct Stone-Forming Medications
- Indinavir is the most notorious antiretroviral for causing nephrolithiasis, with crystalluria occurring in 20% of treated patients and symptomatic stones being a major side effect 1
- Indinavir stones form due to pH-dependent solubility in urine, with risk factors including low lean-body mass, doses of 1000 mg twice daily, and concomitant trimethoprim-sulfamethoxazole use 1
- Ritonavir-boosted indinavir regimens increase nephrolithiasis risk through higher peak drug concentrations 1
- Sulfonamides cause intratubular crystal precipitation leading to acute renal failure, particularly sulfadiazine used for cerebral toxoplasmosis 1
- Ciprofloxacin causes intratubular crystal precipitation; avoidance of rapid intravenous bolus and adequate hydration are essential 1
- Acyclovir causes intratubular crystal precipitation and acute renal failure when given as rapid intravenous bolus without adequate hydration 1
- Foscarnet similarly causes crystal-induced acute renal failure and requires hydration and dose adjustment for renal dysfunction 1
Critical Prevention Strategies
- Daily intake of at least 1.5 liters of water prevents stone formation, particularly in high-risk patients 1
- Avoid rapid intravenous bolus administration of acyclovir, ciprofloxacin, and foscarnet 1
- Adjust doses for renal dysfunction in patients receiving potentially nephrotoxic medications 1
- Monitor for crystalluria in patients taking indinavir, with urinalysis showing pyuria even without visible crystals 1
Monitoring and Risk Assessment
- Environmental conditions (temperature, atmospheric pressure, humidity) affect indinavir nephrolithiasis risk 1
- Coinfection with hepatitis B or C increases risk of indinavir-related stones 1
Medications That Can Cause Kidney Stones
Introduction to Kidney Stone Risk
- Clinicians should routinely query patients about stone-provoking medications and supplements during evaluation for kidney stones, as certain drugs directly increase stone formation risk through crystallization in urine or metabolic effects 2, 3
Metabolic Disruptors and Kidney Stone Risk
- Calcium supplements (as opposed to dietary calcium) may increase stone risk 4
- Diuretics (certain types) can alter renal blood flow and intrarenal hemodynamics 5