Prescription Refill Calculator

Formula

To calculate the number of prescription refills needed:

\[ R = \frac{D \times T}{Q} \]

Where:

\(R\) is the number of refills needed
\(D\) is the dosage per day
\(T\) is the total number of days the prescription needs to last
\(Q\) is the quantity of medication in each refill

What is a Prescription Refill?

A prescription refill is a continuation of a medication that a doctor has previously prescribed, allowing the patient to continue taking the medication without having to visit the doctor again. It is typically authorized for a certain number of refills, indicated on the prescription label, and can be obtained from a pharmacy once the initial supply has been used up. The pharmacist will only refill the prescription if the doctor has approved it and it is not expired.

Example Calculation 1

Let's assume the following values:

Dosage Per Day (D) = 2 pills
Total Number of Days (T) = 30 days
Quantity per Refill (Q) = 20 pills

Use the formula:

\[ R = \frac{2 \times 30}{20} = \frac{60}{20} = 3 \]

The number of refills needed is 3.

Example Calculation 2

Let's assume the following values:

Dosage Per Day (D) = 1 pill
Total Number of Days (T) = 90 days
Quantity per Refill (Q) = 30 pills

Use the formula:

\[ R = \frac{1 \times 90}{30} = \frac{90}{30} = 3 \]

The number of refills needed is 3.