It is generally not recommended to take 5mg/tablet folic acid tablets during pregnancy preparation and should be replaced by 0.4mg/tablet folic acid tablets. Women of childbearing age need to take oral folic acid tablets from the time they plan to get pregnant, in order to prevent congenital neural tube malformations in the fetus due to folic acid deficiency during pregnancy. It is generally recommended that women of childbearing age take 0.4mg/tablet of folic acid tablets until the end of the third trimester of pregnancy. Before taking folic acid tablets it should be clarified that the drug should be contraindicated in people who are allergic to the product. Rare allergic reactions may occur during the use of the drug, and some gastrointestinal adverse reactions, such as nausea and bloating, may also occur with prolonged use of the drug. The specific use of folic acid in the clinic should be carried out under the guidance of a physician, and should not be used without authorization.