Diagnostic and therapeutic drugs may enhance urolithiasis in one or a combi
nation of ways, including: (1) alteration of urine pH in such fashion as to
create an environment that increases the solubility of some lithogenic sub
stances, (2) alteration of glomerular filtration rate, tub;lar reabsorption
, and tubular secretion of drugs of endogenous substances so as to enhance
promoters or impair inhibitors of urolithiasis, and (3) precipitation (e.g.
, drugs or their metabolites) to form a portion or all of a urolith.