The quantity is 100% dependent on what the doctor or prescriber wishes. It depends on the medication, and how long the therapy should last. It depends on what the most effective dosing is and that job belongs to the prescriber.
Suffice it to say, that at your directions of taking 1/2 tablet by mouth twice a day, you will be taking 1 tablet total daily (1/2 tablet plus 1/2 tablet = 1 full tablet).
So if your prescription is written for #30, the medication treatment or prescription will last you for a days supply of 30 days.
Patient is prescribed 10g of Glucose. The glucose is presented as a 5% solution in 500ml Saline. How much of the 5% dextrose saline solution do you need