A stock is 15 mg/mL. The ordered dose is 7.5 mg. How many mL should be given?

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Study for the Archer Pharmacology Test to master dosage calculations and medication administration. Use flashcards and multiple choice questions with detailed explanations. Get ready for your exam!

Multiple Choice

A stock is 15 mg/mL. The ordered dose is 7.5 mg. How many mL should be given?

Explanation:
Concentration tells us how much drug is in each milliliter. Here, 15 mg are in 1 mL. To obtain 7.5 mg, divide the desired dose by the concentration: 7.5 mg ÷ 15 mg/mL = 0.5 mL. So you should administer 0.5 mL. In other words, since 7.5 mg is half of 15 mg, you need half of 1 mL, which is 0.5 mL.

Concentration tells us how much drug is in each milliliter. Here, 15 mg are in 1 mL. To obtain 7.5 mg, divide the desired dose by the concentration: 7.5 mg ÷ 15 mg/mL = 0.5 mL. So you should administer 0.5 mL. In other words, since 7.5 mg is half of 15 mg, you need half of 1 mL, which is 0.5 mL.

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