A woman with previous history of Neural tube defects in her first baby, becomes pregnant again ,what is the recommended folic acid dosage for her?

Generally,folic acid supplementation with 0.4 mg per day is staed at least 1 month before conception., though its best if she takes it for 3 months prior. The dose is increased to 4 mg when a woman with previous history of Neural tube defects in her previous pregnancy becomes pregnant. It should be staed 3 months before conception and continued till first trimester thereafter we switch it with IFA tablets