I've been on elmiron 100 my twice a day for 7 years my Dr put liquid inmy urethra n I had to hold it for 30 mins then go pee. He said I had did chronic intersistual cystitis to take the pills. I was in a car accident that almost killed me did kill my mom fractured 4ribs 4vertabrea in my back broke both legs 3 places tin tin in right one lost below the knee broke right arm plates n screws rods n pins n legs. I'm on 325mg aspirin and have filter for blood clots in groin area it says elmiron is a small blood thinner my question I need to start back on it because I pee 20- 25 times dayn night without it n get cystitis what do you suggest? Thank you.