About this information
This information explains the evidence summary about the unlicensed use of oral pentosan polysulfate sodium (pentosan) for interstitial cystitis, also known as chronic pelvic pain syndrome or bladder pain syndrome. The evidence summary is an overview of the available information about this medicine. It aims to help prescribers and patients when they are considering whether or not to use an unlicensed or off‑label treatment. The summary does not contain recommendations from NICE on whether the medicine should be used.