Phenazopyridine hydrochloride

Phenazopyridine hydrochloride

Phenazopyridine hydrochloride, an azo dye used in commercialcoloring, produces a local analgesic effect on the urinary tract.

Pharmacokinetics

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.

Pharmacodynamics

Phenazopyridine is taken orally and produces an analgesic effect on the urinary tract usually within 24 to 48 hours after therapy be-gins.

Phamacotherapeutics

The drug is used to relieve such symptoms as pain, buring, ur-gency, and frequency associated with urinary tract infections.

Drug interactions

There are no listed drug interactions with phenazopyridine. (See Adverse reactions to phenazopyridine hydrochloride.)