A lady has history of previous child birth with neural tube defect. What is the dose of folic acid to be given to prevent to neural tube defect in this child

Dose of folic acid for primary prevention is 400 mcg / day Dose of folic acid for secondary prevention (prevoius child affected with neural tube defect) is 4000 mcg / day started in periconception period = 1 month before to 3 months after conception.