Comparison of Ferrisat vs Placebo in Anemia Associated to Inflammatory Bowel Disease During Anti-TNF Therapy

Inclusion Criteria: * Age greater than 18 years * Crohn's disease or Ulcerative Colitis defined according to the usual endoscopic, histological, and radiological criteria * Under anti-TNF therapy or indication for starting an anti-TNF therapy * Anemia defined according to World Health Organization (Hemoglobin under 13g/dl for man and Hemoglobin under 12g/dl for woman) * Iron deficiency anemia defined as: * Ferritinemia under 100 if C-Reactive Protein under normal value OR - Ferritinemia between 30 and 100 if C-Reactive Protein above normal value Exclusion Criteria: \-