interstitial cystitis
"I have to take Pyridium. Have been taking it for many years. My urologist says I don't have Interstitial Cystitis but my bladder started burning in 1992 and hasn't stopped, so it may be urogenic bladder. Pyridium does seem to make me drowsy and I itch a lot. But not sure if the Pyridium causes it as I'm on many other medications. It does help the burning of my bladder."