NCIt definition : A synthetic pyridine derivative anesthetic, Phenazopyridine is used as a local anesthetic
in urinary tract disorders to relieve pain of lower urinary-tract irritation, as in
cystitis, urethritis or prostatitis. Compatible with relief of pain and discomfort
in antibacterial therapy, its use is limited however due to toxicity (primarily blood
disorders) and potential carcinogenicity. (NCI04);