"Supply needed" means how many pills will it take to fill the prescription.
It just takes some simple math to solve that question.
2 tablets four times a day for 7 days means:
2 times 4 times 7 = 56
56 tablets is the supply needed which will allow the customer or patient to have all the pills or tablets that person needs to complete the medication therapy for the allotted duration the provider intended.
A prescription for vistaril 50mg reads: take 100mg every 12 hours for 14 days. The pharmacy has 50mg capsules in stock. How many capsules should be dispensed