The amount of folic acid tablets of 5mg size to be taken in a day varies according to adults and children, generally you can take 1 to 3 tablets. 1. Children: Children can take 1 tablet per day, which can be divided into three times, according to their own conditions and under the guidance of a medical professional to decide the amount of dosage. 2. Adults: Pregnant women during pregnancy can take 5mg of folic acid supplement once a day, and should consult a medical professional for details. The main indications for folic acid are folic acid deficiency, fetal congenital neural tube malformation and megaloblastic anemia, etc. At present, the adverse reactions are less, long-term use can produce nausea and abdominal distension and other side effects, allergic patients are prohibited from taking this drug. The use of drugs need to be under the guidance of a doctor.