Adults
In folate deficient megaloblastic anaemia:
5 mg daily for 4 months
Up to 15 mg daily may be necessary for malabsorption states
For prophylaxis in chronic haemolytic states or in renal dialysis:
5 mg every 1-7 days depending on diet and underlying disease.
In drug induced folate deficiency:
5 mg daily
Prevention of recurrence of neural tube defects
5 mg daily starting before conception and continuing throughout the first trimester of pregnancy is recommended.
Children
Over 1 year: As adult dose
Up to 1 year: 500 µg/kg daily
For dosage and administration of children with various weights it should use Folic acid 1 mg tablets too.