Oral Folate-deficient megaloblastic anaemia Adult: 5 mg daily for 4 mth, up to 15 mg daily in malabsorption states. Continued dosing at 5 mg every 1-7 days may be needed in chronic haemolytic states, depending on the diet and rate of haemolysis. Prophylaxis of megaloblastic anaemia in pregnancy Adult: 0.2-0.5 mg daily. Prophylaxis of neural tube defect in pregnancy Adult: 4 or 5 mg daily starting before pregnancy and continued through the 1st trimester. As supplement for women of child-bearing potential Adult: 0.4 mg daily.