Phenazopyridine
"This medication has helped me greatly in coping with Interstitial Cystitis (IC). There are different types of pain associated with IC, and this medication helps with one of the most debilitating which is a hot poker feeling that starts in the urethra and continues straight up the center. Also, some of the urgency to urinate is relieved.  Even with this medication I am attached to a heating pad, but without it there is nothing left of me other than the pain.
As for side effects, I have to eat first or I become nauseous with occasional vomiting and headaches. Well worth it."