Rectal foam or suppositories to treat ulcerative colitis (proctitis) or for Crohn's disease affecting the rectum. Longer-acting steroid injections may take about a week to become effective but can then be effective for two months or even longer. There is no evidence they provide any relief after six months. Steroids http://www.drugoffice.gov.hk/gb/unigb/tr.wikipedia.org/wiki/Vitamin