What is the recommended schedule for administration of the hepatitis a vaccine?

With in 6 to 18 months of initial dosage

Explanation:

As per the standard dosage chart -  

The first dose must be given at the age of 6 month. However, this age can be extended at till the age of 18 month. The quantity of dose must be equal to 0.5mL.This is applicable to all children and adolescents.  

For adult people, the right age of taking dosage must be between 19 years to any older age. The quantity of dosage must be 1.0 mL which must be given within 6 to 18 months of initial dosage.