- Clinical diagnosis of Interstitial cystitis based on the National Institute of Diabetes, Digestive and Kidney Diseases (NIDKK) criteria. According the NDIKK criteria, IC patients must have either glomerulations on cystoscopic examination or classic Hunner Ulcers and must also have either pain associated with the bladder or urinary urgency. Symptoms of abnormal urinary frequency and bladder pain/discomfort must have been present for at least 3 months prior to study entry