A pharmacy technician is calculating the days supply for a 5 mL eye drop bottle with instructions to instill 1 drop in each eye twice daily. What is the days' supply for this bottle?

To determine the days' supply for the 5 mL eye drop bottle, it’s necessary to first calculate how many drops are in the bottle. An average drop from an eye dropper is approximately 0.05 mL. Therefore, in a 5 mL bottle, the total number of drops can be calculated as follows:

The calculation starts with the total volume of the bottle divided by the volume of each drop:

5 mL / 0.05 mL per drop = 100 drops.

Next, according to the prescription instructions, the patient is to instill 1 drop in each eye twice daily. This means:

1 drop in the first eye + 1 drop in the second eye = 2 drops per dose.

Since this occurs twice a day, the total number of drops used daily is:

2 drops per dose x 2 doses per day = 4 drops per day.

Now, to find out how many days the bottle will last, divide the total number of drops by the daily usage:

100 drops / 4 drops per day = 25 days.

Thus, the correct answer indicates that the 5 mL eye drop bottle would last for 25 days, allowing the patient to follow the prescribed dosage