Taking folic acid will not cause patients to have dizziness, folic acid is a relatively safe drug, and in the clinical adverse reactions are very few, rare may have some allergic reactions. However, after taking folic acid for a long time, there may be gastrointestinal symptoms, such as anorexia, nausea, abdominal distension, fever and other symptoms. Folic acid is clinically available to pregnant women all over the world, the role of folic acid is mainly the following aspects: 1, pregnant women can prevent fetal neural tube malformations, including brain bulge, spina bifida. 2, can prevent congenital heart disease. 3, pregnant women can prevent the occurrence of cleft lip and palate. 4, folic acid in the clinic is mainly used for the treatment of various kinds of megaloblastic anemia. 5, folic acid is used for the treatment of the anemia. 6, folic acid is mainly used for the treatment of the anemia. 7, folic acid is mainly used for the treatment of the anemia. 8, folic acid is mainly used for the treatment of the anemia.