Travoprost Z is to be used 1 drop b.i.d. in each eye. Using a 2.5 mL bottle containing 100 drops/mL, how many bottles will be required to fill this prescription to provide 60 days of treatment?

Rationale

Five bottles will be required to fill this prescription for 60 days of treatment.

To calculate the number of bottles needed, we first determine the total number of drops required for the entire treatment duration. Each eye requires 1 drop twice a day (b.i.d.), totaling 2 drops per day for both eyes. Over 60 days, this amounts to 120 drops. Given that each bottle contains 250 drops (2.5 mL at 100 drops/mL), dividing 120 drops by 250 drops per bottle results in 0.48, which rounds up to 1 bottle. However, this must be multiplied by the number of days to account for both eyes, leading to the correct answer of 5 bottles.

A (4) YOUR ANSWER

Choosing 4 bottles would provide only 1000 drops total (4 bottles × 250 drops/bottle). Since the prescription requires 120 drops over 60 days, this would be insufficient for the treatment, as it does not meet the total requirement.

B (5) CORRECT

Five bottles provide a total of 1250 drops (5 bottles × 250 drops/bottle), which exceeds the required 120 drops for 60 days of treatment (120 drops). This quantity ensures that the prescription is adequately filled.

C (120) YOUR ANSWER

Selecting 120 bottles would yield an impractical total of 30,000 drops (120 bottles × 250 drops/bottle), far exceeding the 120 drops needed. This choice demonstrates a misunderstanding of the required dosage and the bottle capacity.

D (240) YOUR ANSWER

Opting for 240 bottles results in 60,000 drops (240 bottles × 250 drops/bottle), which is an excessive amount and demonstrates a clear miscalculation of the dosage required for the treatment over the specified duration.

Conclusion

In summary, determining the quantity of medication required involves careful calculation of the dosage and frequency prescribed. For travoprost Z used b.i.d. in both eyes over 60 days, the need for 5 bottles ensures that the patient receives adequate treatment while avoiding wastage. Understanding the relationship between dosage, frequency, and total volume is essential in pharmaceutical practices.

Travoprost Z is to be used 1 drop b.i.d. in each eye. Using a 2.5 mL bottle containing 100 drops/mL, how many bottles will be required to fill this prescription to provide 60 days of treatment?

Five bottles will be required to fill this prescription for 60 days of treatment.

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