What should the "days supply" on a prescription be based upon?

The “days supply” on a prescription refers to the quantity of medication prescribed and the frequency with which it is to be taken, which ultimately determines how long the medication will last for the patient. This is based on a calculation that accounts for the dosage prescribed, the total number of doses prescribed, and the frequency of administration.

For example, if a medication is prescribed to be taken twice daily for a month, the total number of doses can be calculated as 2 doses per day multiplied by 30 days, resulting in a total of 60 doses. If the pharmacy dispenses a suitable quantity that ensures the patient has enough medication for the prescribed duration, it provides clarity and prevents medication shortages or unnecessary interruptions for the patient.

Choosing to derive the “days supply” solely from estimated medication effectiveness, a patient’s age, or recommended dosages for adults may overlook the specific context of the patient's treatment plan, leading to potential inaccuracies in how long a supply of medication is available. Thus, focusing on a calculated approach ensures that the supply aligns accurately with the prescribed regimen.