Oral iron protein succinate can cause constipation. Oral solution of iron protein succinate is a brownish red viscous clarified liquid with aromatic odor and sweet taste. It is mainly used for the treatment of absolute and relative anemia. Treatment of occult or overt iron deficiency anemia due to inadequate iron intake or impaired absorption, acute or chronic blood loss and infections in patients of all ages and treatment of anemia in pregnant and lactating women. Allergic to ferric protein succinate, chronic pancreatitis and cirrhosis, iron hemosiderosis, hemochromatosis, aplastic anemia, hemolytic anemia, iron utilization disorders of anemia patients are prohibited; children, the elderly use with caution. Constipation is one of the common adverse reactions of iron proteinsuccinate, mainly due to the consumption of iron proteinsuccinate can cause intestinal peristalsis slowed down, resulting in symptoms of constipation, general constipation symptoms can be slowly relieved after stopping the drug. The symptoms of constipation can be relieved after stopping the drug. Iron proteinsuccinate is recommended to be taken under the guidance of a doctor and should not be used without authorization.