1) Pyridium 
<chemical> A local anaesthetic that has been used in urinary tract disorders. Its use is limited by problems with toxicity (primarily blood disorders) and potential carcinogenicity. ... Pharmacological action: anaesthetics, local. ... Chemical name: 2,6-Pyridinediamine, 3-(phenylazo)- ... (12 Dec 1998) ... 
(fen″ә-zo-pēr´ĭ-dēn) a urinary tract analgesic, used as the hydrochloride salt; administered orally.
[n] - analgesic (trade name Pyridium) used to treat urinary tract infections
Pyridium noun analgesic (trade name Pyridium) used to treat urinary tract infections