Skip to Main Navigation
Skip to Page Content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Share This:

Phenazopyridine hydrochloride: Target Organs and Levels of Evidence for TR-099

Bioassay of Phenazopyridine Hydrochloride for Possible Carcinogenicity (CASRN 136-40-3)

Chemical (Study Title)
Peer Review DateRoute/Exposure LevelsStudy Laboratory
Phenazopyridine hydrochloride
R: 0,3700,7500, M: 0,600,1200 PPM/35 PER GROUP
Southern Research Institute

Levels of Evidence

Male Rats: Positive
TypeOrgan/Tissue (Lesion)
Neoplastic Lesions
  • Intestines: (ADENOCARCINOMA)
Female Rats: Positive
TypeOrgan/Tissue (Lesion)
Neoplastic Lesions
  • Intestines: (ADENOCARCINOMA)
Male Mice: Negative
Female Mice: Positive
TypeOrgan/Tissue (Lesion)
Neoplastic Lesions