Phenazopyridine hydrochloride, an azo dye used in commercialcoloring, produces a local analgesic effect on the urinary tract.
When taken orally, the liver metabolizes 35% of phenazopyridine. The remainder is excreted unchanged in the urine, causing the pa-tient’s urine to turn an orange or red color.
Phenazopyridine is taken orally and produces an analgesic effect on the urinary tract usually within 24 to 48 hours after therapy be-gins.
The drug is used to relieve such symptoms as pain, buring, ur-gency, and frequency associated with urinary tract infections.
There are no listed drug interactions with phenazopyridine. (See Adverse reactions to phenazopyridine hydrochloride.)