Magnesium sulfate is ordered at 2 g/hour. The label shows 20 g in 500 mL of 0.9% saline. How many milliliters per hour should be infused?

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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

Magnesium sulfate is ordered at 2 g/hour. The label shows 20 g in 500 mL of 0.9% saline. How many milliliters per hour should be infused?

Explanation:
The calculation tests IV infusion rate by converting the prescribed dose into a volume using the solution’s concentration. The label provides 20 g in 500 mL, which is 20/500 = 0.04 g/mL (40 mg/mL). To deliver 2 g per hour, divide by the concentration: 2 g/hour ÷ 0.04 g/mL = 50 mL/hour. So, infuse at 50 mL per hour.

The calculation tests IV infusion rate by converting the prescribed dose into a volume using the solution’s concentration. The label provides 20 g in 500 mL, which is 20/500 = 0.04 g/mL (40 mg/mL). To deliver 2 g per hour, divide by the concentration: 2 g/hour ÷ 0.04 g/mL = 50 mL/hour. So, infuse at 50 mL per hour.

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