5 mg daily for 4 months; up to 15 mg daily maybe necessary in malabsorption states or as prescribed by the physician.
Prophylaxis of megaloblastic anemia of pregnancy: Usual dose is 0.2 to 0.5 mg up to 1 mg daily or as prescribed by the physician.
For women of child bearing potential at high risk of having a pregnancy affected by neural tube defect: 4 or 5 mg daily starting before pregnancy and continued through the first trimester or as prescribed by the physician.