Rectal foam or suppositories to treat ulcerative colitis (proctitis) or for Crohn's disease affecting the rectum. Steroids can be classified based on their chemical composition.[52] One example of how MeSH performs this classification is available at the Wikipedia MeSH catalog. Examples of this classification include: Steroids play critical roles in https://www.webwiki.com/tr.wikipedia.org/wiki/Vitamin