Silium is the trade name for folic acid tablets, which are good for preventing fetal congenital neural tube malformations and should be used according to doctor’s instructions. Folic acid is essential for the growth and reproduction of human cells, and folic acid tablets are good for the prevention of fetal congenital neural tube malformation. It is used as a preventive medicine for lactating women and during pregnancy. Adverse effects of folic acid tablets are rare, allergic reactions can be seen, long-term use may be nausea, fear of food, abdominal distension and other adverse reactions. Large amounts may cause urine to be yellow in color. It is contraindicated for those who are allergic to the product. Large doses of folic acid interact with antiepileptic such as phenobarbital, pemidone and phenytoin sodium, and may also affect the absorption of zinc. It should be used appropriately under medical supervision.