For the prescription Imitrex 25mg, SIG: 1 t q 4-6h pm headache for 3 days, what is the quantity to dispense?

To determine the correct quantity to dispense for the prescription of Imitrex 25mg with the specified instructions, let's break down the directions:

The prescription indicates to take one tablet every 4 to 6 hours as needed for headaches, for a duration of 3 days.

In a 24-hour period, considering the maximum frequency of dosing, the patient could take the medication every 4 hours. This would allow for a total of 6 doses in one day (24 hours divided by 4 hours). Over the course of 3 days, the patient could therefore potentially take up to 18 doses (6 doses/day multiplied by 3 days).

The selection of 18 as the quantity to dispense reflects a practical number that accommodates a patient needing to take the medication at the maximum frequency outlined in the prescription. This ensures that the patient has enough medication on hand without unnecessarily exceeding the amount that may be required.

Dispensing less than 18, such as 12 or 3, would not provide sufficient medication if the patient experiences multiple headaches during the 3-day period and needs to follow the maximum regimen specified. Dispensing 30 would give more than was indicated as necessary for the specified duration and could potentially lead to misuse or unnecessary medication