An IV infusion contains 750 mg of a drug in 75 mL and must be delivered over 90 minutes. What is the rate in mL/hour?

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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

An IV infusion contains 750 mg of a drug in 75 mL and must be delivered over 90 minutes. What is the rate in mL/hour?

Explanation:
Infusion rate is found by dividing the total volume by the total time. Convert 90 minutes to hours: 90 minutes is 1.5 hours. Then 75 mL ÷ 1.5 h = 50 mL/hour. So the delivery rate is 50 mL/hour. The amount of drug (750 mg) sets the concentration (750 mg in 75 mL = 10 mg/mL), but does not change the mL/hour rate. If you needed mg/hour, that concentration would matter (50 mL/hour × 10 mg/mL = 500 mg/hour).

Infusion rate is found by dividing the total volume by the total time. Convert 90 minutes to hours: 90 minutes is 1.5 hours. Then 75 mL ÷ 1.5 h = 50 mL/hour. So the delivery rate is 50 mL/hour. The amount of drug (750 mg) sets the concentration (750 mg in 75 mL = 10 mg/mL), but does not change the mL/hour rate. If you needed mg/hour, that concentration would matter (50 mL/hour × 10 mg/mL = 500 mg/hour).

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