The PHCP prescribes lidocaine at 2 mg/min. The label reads lidocaine 1 gram in 500 mL of 0.9% saline. How many mL per hour will be administered?

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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

The PHCP prescribes lidocaine at 2 mg/min. The label reads lidocaine 1 gram in 500 mL of 0.9% saline. How many mL per hour will be administered?

Explanation:
This question tests converting a prescribed rate in mg per minute to an infusion volume per hour using the product’s concentration. First, turn the dose into mg per hour: 2 mg/min × 60 minutes = 120 mg/hour. Then find how much lidocaine is in each milliliter from the label: 1,000 mg in 500 mL equals 2 mg/mL. Now relate the hourly dose to the concentration to get mL per hour: 120 mg/hour ÷ 2 mg/mL = 60 mL/hour. Sanity check: at 60 mL/hour, you deliver 60 × 2 mg/mL = 120 mg/hour, which matches the prescribed rate.

This question tests converting a prescribed rate in mg per minute to an infusion volume per hour using the product’s concentration. First, turn the dose into mg per hour: 2 mg/min × 60 minutes = 120 mg/hour. Then find how much lidocaine is in each milliliter from the label: 1,000 mg in 500 mL equals 2 mg/mL. Now relate the hourly dose to the concentration to get mL per hour: 120 mg/hour ÷ 2 mg/mL = 60 mL/hour. Sanity check: at 60 mL/hour, you deliver 60 × 2 mg/mL = 120 mg/hour, which matches the prescribed rate.

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