Pentosan Home>Pharmacy>Drugs_and_Medications>P>Pentosan     Web Pages Pentosan (Systemic) - Medline Plus Brief summary for patients from the National Library of Medicine. Elmiron Full prescribing information from RxList. Elmiron (Pentosan Polysulfate) Manufacturer's information for this oral medication for the relief of bladder pain or the discomfort of interstitial cystitis.