Folic acid tablets are oral medication, used for different diseases, the dosage is inconsistent, can not be simply summarized, specific as follows. 1. For folic acid deficiency caused by various reasons and megaloblastic anemia due to folic acid deficiency, the dosage is taken orally, adults, 1~2 tablets once a day, 3 times a day until the blood picture returns to normal; children, 1 tablet once a day, 3 times a day (or 1~3 tablets once a day, divided into 3 times). 2. For the prevention of congenital neural tube malformation of the fetus, the dosage is oral, women of childbearing age from the time of planning pregnancy to the end of the second trimester of pregnancy, 0.4 mg once a day, once a day. For prophylactic use in pregnant and lactating women, 0.4 mg once a day. The above is the recommended dosage for the instruction, patients should use the medicine reasonably under the guidance of professional doctors. A very small number of patients may have allergic reactions when using folic acid tablets, folic acid tablets can cause anorexia, nausea, abdominal distension and other gastrointestinal symptoms when taking a large amount of long-term use, the use of attention should be paid. Pernicious anemia and megaloblastic anemia caused by vitamin B12 insufficiency can not be treated with folic acid tablets alone; excessive use of folic acid tablets will antagonize the antiepileptic effect of phenobarbital, phenytoin sodium, etc., and therefore should be avoided. If you need to use folic acid tablets, please consult a professional doctor and strictly follow the doctor’s instructions.