A medication is supplied as 250 mg per 5 mL. If you need to administer 150 mg, how many milliliters should be drawn?

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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 medication is supplied as 250 mg per 5 mL. If you need to administer 150 mg, how many milliliters should be drawn?

Explanation:
You determine how much volume to draw by using the concentration of the medication. The solution is 250 mg in 5 mL, which equals 50 mg per mL. To deliver 150 mg, divide the dose by the concentration: 150 mg ÷ 50 mg/mL = 3 mL. Cross-check with cross-multiplication: 250 mg/5 mL = 150 mg/x mL gives x = (150 × 5) / 250 = 3 mL. Back-calculate to confirm: 3 mL × 50 mg/mL = 150 mg. Draw 3 mL.

You determine how much volume to draw by using the concentration of the medication. The solution is 250 mg in 5 mL, which equals 50 mg per mL. To deliver 150 mg, divide the dose by the concentration: 150 mg ÷ 50 mg/mL = 3 mL. Cross-check with cross-multiplication: 250 mg/5 mL = 150 mg/x mL gives x = (150 × 5) / 250 = 3 mL. Back-calculate to confirm: 3 mL × 50 mg/mL = 150 mg. Draw 3 mL.

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