Rapid increase in calculous size: a possible hazard of phenazopyridine hydrochloride therapy in the presence of already formed stones.
Phenazopyridine hydrochloride is an effective oral urinary analgesic commonly used for the treatment of irritative lower urinary tract conditions. We believe that stones already present may serve as a nidus for significant deposition of phenazopyridine hydrochloride.
D006801:Humans; D008297:Male; D008875:Middle Aged; D010621:Phenazopyridine / Q000009:adverse effects*; D011725:Pyridines / Q000009:adverse effects*; D001744:Urinary Bladder Calculi / Q000139:chemically induced* / Q000473:pathology
D011725:Pyridines; D010621:Phenazopyridine