“…Other limitations to oral iron therapy are low levels of adherence, lack of suitability for patients with severe bleeding or continuous occult blood loss, the excessive time (months) required to replenish iron stores, and the lack of clarity regarding total costs, which may be higher than initially expected when absenteeism/presenteeism considerations are also taken into consideration. Newer intravenous iron compounds are considered safer than blood transfusion, have fewer GI side effects than oral iron (99,100), and are also associated with improved/guaranteed adherence (66,90,93,100,101). These compounds also provide the total iron dose required (often in a single infusion), quickly increase hemoglobin levels, and promote more effective replenishment of iron stores in comparison with oral iron (66,90,93,(100)(101)(102)(103).…”