Folic acid belongs to the non-prescription drugs, commonly used folic acid tablets, folic acid belongs to vitamin B, usually taken orally before the third month of preparation for pregnancy, in order to prevent neural tube malformations, should be taken until about the third month of pregnancy, the specific dosage of the medication needs to be used under the guidance of a doctor. The exact dosage needs to be instructed by your doctor. The dosage varies for each individual. Folic acid is generally applicable to women who are preparing for pregnancy, pregnant women, lactating women, etc. The dosage of folic acid is as follows: take orally, about 30 minutes after meals, if taken before meals, it may stimulate the stomach and cause stomach pain affecting the appetite, take it from the first trimester of preparing for pregnancy to the third month of post-pregnancy, 0.4mg at a time, once a day. Supplementation of folic acid before pregnancy and early pregnancy can be a good way to prevent fetal malformations, effectively prevent anemia in pregnant women, and promote the development of the placenta to help provide comprehensive and adequate nutrition for the fetus. Excessive use of folic acid will affect zinc metabolism, delay fetal growth and development, and cause endocrine disorders. Please standardize the use of drugs under the guidance of a physician.