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Drug-induced urolithiasis are observed in 1.6% of the urinary calculi in France. Drugs crystals are identified in two thirds of these stones. Other drugs are responsible for stones which have an apparent metabolic origin (one third of the cases). Stone analysis using physical methods such as infrared spectroscopy is needed to unambiguously identify stones containing drugs. The inquiry is an important step to identify lithogenetic drugs which do not crystallize in the stones. The main substances which were identified in stones over the past decade were indinavir monohydrate (31.4%), triamterene (11.1%), sulphonamides (10.5%) and amorphous silica (4.5%). The main drugs involved in the nucleation and growth of metabolic stones were calcium and vitamin D supplementation (15%) and long-term treatment with carbonic anhydrase inhibitors (8%). Stone prevention is based on drug withdrawal or change in dosage with additional measures including an increase of diuresis and, if necessary, changes in the urine pH.


M Daudon. Drug-induced urinary calculi in 1999]. Progrès en urologie : journal de l'Association française d'urologie et de la Société française d'urologie. 1999 Dec;9(6):1023-33

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PMID: 10658246

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