According to above mentioned prescription, you have to take one sachet once weekly 30mints after any meal, To be more precise if u have started taking one sachet suppose on Sunday,Then the next one sachet would be the on coming Sunday with an exact gap of one week.
How to use:- Mix one sachet in one glass of normal water/milk which ever suits you. If taking along with milk the absorption rate will be good as Vit D need fats for it's better absorption, but anything of your choice would be fine.
In addition to this exposure to sunlight which is a natural source of Vit D will prevent you form further deficiency in future.
Next Steps
After competition of 4 sachet that would be after 1 months.
Get your Vit D levels cheaked again.
Health Tips
For more queries consult a doctor.