Rapid Increase in Calculous Size: a Possible Hazard of Phenazopyridine Hydrochloride Therapy in the Presence of Already Formed Stones

Abstract
Phenazopyridine hydrochloride is an effective oral urinary analgesic commonly used for the treatment of [patients with] irritative lower urinary tract conditions. Stomes already present may serve as a nidus for significant deposition of phenazopyridine hydrochloride.

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