Whether ferrous sulfate is a good blood supplement depends on the cause of the anemia. If it is iron deficiency anemia, the treatment is more effective. The drug is mainly used for the treatment of iron deficiency anemia, and patients need to strictly follow the doctor’s instructions to use the drug. Ferrous sulfate in the clinic is mainly used for the treatment of iron deficiency anemia caused by malnutrition, chronic blood loss, child development, pregnancy and other causes. It is mainly through the supplementation of iron to correct iron deficiency anemia, and with the use of vitamin C to promote the absorption of iron, and also involved in the metabolism of fat, protein and carbohydrates. However, the drug is contraindicated in cases of severe hepatic impairment, especially with untreated urinary tract infections. It is also contraindicated in patients with iron overload, hemosiderosis or hemochromatosis. The drug is also not suitable for the treatment of non-iron deficiency anemia such as thalassemia. Meanwhile, patients should not take the drug with strong tea and try to take it after or during meals to reduce gastrointestinal irritation. If serious adverse reactions occur, it is necessary to stop the drug in time. It is recommended that patients take ferrous sulfate according to their own situation, and strictly follow the doctor’s instructions to avoid long-term or overdose.