Interstitial Cystitis Drugs Market, By Drug Class (Non-steroidal Anti-inflammatory Drugs, Tricyclic Antidepressants, Pentosan Polysulfate Sodium (Elmiron), Dimethyl Sulfoxide (DMSO), Others (Anti-histamines, etc.)), By Type (Non-ulcerative, Ulcerative), By Route of Administration (Oral, Intravesical), By Distribution Channel (Hospital Pharmacies, Retail Pharmacies, Online Pharmacies), By Geography (North America, Latin America, Europe, Middle East & Africa, and Asia Pacific)