Long-term use of iron dextrose will have side effects on the gastrointestinal tract, may produce nausea, vomiting and other adverse reactions, but also slow down intestinal peristalsis, causing constipation and so on. Iron dextrose belongs to the iron agent, usually the duration of use is not more than two months, should be adjusted under the guidance of the doctor according to the patient’s physical condition. Common adverse effects of iron dextrose include nausea, vomiting, abdominal pain, etc. When acting on the intestinal tract, prolonged application will slow down intestinal peristalsis and cause constipation, and some patients may even have black stools. Iron dextrose should be used with caution, allergy is prohibited, severe liver and kidney function damage, untreated urinary tract infection is prohibited, iron overload, hemochromatosis, non-iron deficiency anemia is prohibited, whether the drug should be used strictly follow the doctor’s advice. During the use of the drug patients should regularly check the blood and serum iron levels, long-term use is not recommended, when the overdose or serious adverse reactions should seek medical attention. When taking iron dextrose, it should be noted that alcohol should not be consumed, should not be taken with strong tea, should be taken after or during meals to reduce gastrointestinal irritation, should be taken with vitamin C to increase drug absorption, and should be used with phosphate drugs such as zoledronic acid phosphate to hinder iron absorption. When using medication, you should strictly follow the doctor’s instructions to rationalize the use of medication, do not blindly take medication.