A technician at Birchwood Pharmacy receives a prescription for Lerato Mokoena: latanoprost 0.005% ophthalmic solution, one drop into each eye every evening, dispensed as a single 2.5 mL bottle. Using the standard estimate that an ophthalmic dropper delivers about 20 drops per millilitre, what days supply should the technician enter for this dispense?
- AAbout 50 days, treating each bottle as delivering one drop per day total.
- BAbout 25 days, based on two drops used each day from roughly 50 drops in the bottle. Correct
- CAbout 12 days, counting four drops into each eye every evening.
- DAbout 30 days, rounding the bottle to a convenient monthly figure.
Why A is wrong: This counts only one drop daily and ignores that both eyes are dosed, so it doubles the true supply by halving the daily drop count.
Why B is correct: The 2.5 mL bottle yields about 50 drops, and one drop per eye each evening is two drops per day, so 50 divided by 2 gives roughly 25 days.
Why C is wrong: This misreads the directions as four drops per eye; the sig states one drop per eye, so it overstates daily use and understates the supply.
Why D is wrong: Rounding to a calendar month ignores the actual drop maths; 30 days would require fewer than two drops daily, which the sig does not support.