From the manufacturer's website:
AZO Urinary Pain Relief® is specially formulated with Phenazopyridine Hydrochloride, the #1 ingredient prescribed by doctors for urinary discomfort.
UTI pain doesn’t feel like common pain. So don’t waste your time with common pain relievers.
AZO Urinary Pain Relief® contains something that general pain relievers don't: Phenazopyridine Hydrochloride, which is specially formulated to go directly to the source of the UTI discomfort. Unlike general pain relievers, it provides relief right where it hurts. You’ll feel it working in no time.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.