A vial contains 1.5 mg/mL; you need to deliver 6 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 vial contains 1.5 mg/mL; you need to deliver 6 mg. How many milliliters should be drawn?

Explanation:
When you have a drug concentration, you convert the prescribed dose into the volume to draw using Volume = Dose ÷ Concentration. Here, the vial provides 1.5 mg for every 1 mL. To get 6 mg, divide 6 by 1.5, which equals 4. So drawing 4 mL delivers 6 mg (4 × 1.5 mg). Drawing less would give less than 6 mg, and drawing more would give more than 6 mg, so 4 mL is the exact amount.

When you have a drug concentration, you convert the prescribed dose into the volume to draw using Volume = Dose ÷ Concentration. Here, the vial provides 1.5 mg for every 1 mL. To get 6 mg, divide 6 by 1.5, which equals 4. So drawing 4 mL delivers 6 mg (4 × 1.5 mg). Drawing less would give less than 6 mg, and drawing more would give more than 6 mg, so 4 mL is the exact amount.

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