Patients with iron deficiency anemia are usually safer and more effective taking iron orally, specific iron deficiency anemia patients in oral iron dosage precautions include the following: 1. For patients with excessive iron load, such as patients with long-term recurrent bleeding or hemochromatosis, or patients with iron-containing hemoglobinopathies, etc. need to be prohibited; 5. For patients with non-iron deficiency anemia, such as thalassemia, etc. must be prohibited. 2. Notes on how to take oral iron: 1. Preventive doses should be used for daily iron supplementation; 2. Therapeutic doses of iron should not be applied in large quantities for a long time, and patients’ blood and serum ferritin should be monitored during application; 3. absorption; 5, iron can not be taken with strong tea, otherwise it will affect the absorption of iron; 6, some special drugs, such as tetracycline, phosphonates, etc., can not be applied together with oral iron, otherwise it will affect the absorption of iron.