The present invention comprises packaged enemas for the treatment of Inflammatory Bowel Disease (IBD), having substantially pure 5-ASA as the active ingredient, with a liquid carrier medium having a material avoidance of bowel irritant substances, such as anti-oxidants for the 5-ASA active ingredient, including such sulfites as potassium metabisulfite, for example, and contained within a sealed and substantially oxygen-free barrier package, which may preferably be formed of a foil/polymer laminate, and which package contains or otherwise includes an oxygen scavenger, such as a an oxygen scavenging sachet.