Gastroduodenal ulcers and reflux esophagitis are not recommended to take Iron Protein Succinate Oral Solution at the same time, at least 2 hours apart. Iron Protein Succinate Oral Liquid is used for the treatment of absolute and relative iron deficiency anemia. For example, the treatment of iron deficiency anemia such as insufficient iron intake, impaired absorption, or acute and chronic blood loss, as well as occult or dominant iron deficiency anemia caused by infections in patients of all ages, and the treatment of anemia during pregnancy and lactation. Due to iron absorption in the intestinal tract, it is clearly stated in the instructions for Iron Protein Succinate Oral Liquid that the use of antacids or medications used to treat gastric ulcers and esophageal reflux such as omeprazole and pantoprazole when taken concomitantly may diminish iron absorption. It is recommended that they not be taken at the same time and that they be given at least 2 hours apart. In addition, Iron Protein Succinate Oral Solution may cause adverse reactions of stomach pain, nausea, vomiting, constipation and diarrhea, which may subside rapidly after dosage reduction or discontinuation of the drug. For gastroduodenal ulcer and reflux esophagitis with the above symptoms, the drug should be used with caution. Moreover, since the drug contains iron, it may cause black stools, which may affect the judgment of the condition if black stools are caused by bleeding from ulcers during the administration of the drug or if the patient needs to be observed for the presence of black stools. Therefore, in gastroduodenal ulcer and reflux esophagitis patients applying iron protein succinate oral solution for blood supplementation therapy, first of all, it is necessary to clarify the iron deficiency anemia, and secondly, it is necessary to pay attention to not take at the same time with the commonly used medicines for the treatment of this disease, such as omeprazole.