Certification of Pharmacy Technicians (ExCPT) Practice Exam

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If a compounded prescription requires 5 g of tetracycline, how many 500 mg capsules are needed?

  1. 10

  2. 20

  3. 50

  4. 100

The correct answer is: 10

To determine the number of 500 mg capsules needed for a compounded prescription requiring 5 g of tetracycline, it is essential to convert grams to milligrams. Since 1 gram is equivalent to 1000 milligrams, 5 grams equals 5000 milligrams (5 g x 1000 mg/g = 5000 mg). Next, to find out how many 500 mg capsules are needed, you would divide the total amount required (5000 mg) by the amount in each capsule (500 mg). Calculating this gives: 5000 mg รท 500 mg/capsule = 10 capsules Thus, the correct answer is that 10 capsules are needed. This method clearly demonstrates how to convert between units and calculate the required amount based on dosage form, which is a critical skill in pharmacy practice.

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