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Calculating the days supply of inventory is an essential skill for pharmacy students and professionals. It helps in managing stock levels, ensuring medication availability, and optimizing inventory costs. Below are some practice exercises designed to strengthen your understanding of how to calculate days supply. Answers are provided at the end for self-assessment.
Exercise 1
A pharmacy dispensed 600 tablets of a medication that is prescribed at a dose of 2 tablets per day. If the total quantity is 600 tablets, what is the days supply?
Answer
Days supply = Total quantity / Daily dose
Days supply = 600 tablets / 2 tablets per day = 300 days
Exercise 2
A patient receives a prescription for 90 mL of a liquid medication, with a dosage of 10 mL per day. How many days will this supply last?
Answer
Days supply = Total volume / Daily volume
Days supply = 90 mL / 10 mL per day = 9 days
Exercise 3
An order includes 120 capsules, with a patient taking 1 capsule twice daily. What is the days supply?
Answer
Daily dose = 2 capsules per day
Days supply = 120 capsules / 2 capsules per day = 60 days
Exercise 4
A patient is prescribed 30 tablets of medication, taking 1 tablet daily. How many days does the supply cover?
Answer
Days supply = Total tablets / Daily dose
Days supply = 30 tablets / 1 tablet per day = 30 days
Exercise 5
A prescription for 500 mL of a liquid medication is given with a dosage of 50 mL twice daily. How long will this supply last?
Answer
Daily volume = 50 mL x 2 = 100 mL
Days supply = Total volume / Daily volume
Days supply = 500 mL / 100 mL per day = 5 days
Summary
Calculating days supply involves dividing the total quantity of medication by the daily dose or volume. Practice with different types of medications, including solids and liquids, to become proficient in this essential skill.