Dosage Calculation RN Fundamentals Online Practice Assessment 3.0

Dosage Calculation RN Fundamentals Online Practice Assessment 3.0
Question
1. A nurse is preparing to administer codeine 20 mg PO every 6 hr PRN pain. Available is
codeine oral solution 10 mg/ 5 mL. How many mL should the nurse administer per dose?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use atrailing zero.)
Answer: 10 mL
Follow these steps for the Ratio and Proportion method of calculation:
Step 1: What is the unit of measurement the nurse should calculate? mL
Step 2: What is the dose the nurse should administer? Dose to administer = Desired 20 mg
Step 3: What is the dose available? Dose available = Have 10 mg
Step 4: Should the nurse convert the units of measurement? No
Step 5: What is the quantity of the dose available? 5 mL
Step 6: Set up an equation and solve for X. Have/Quantity = Desired/X
10 mg/ 5 mL = 20 mg/ X mL
X mL = 10 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 10 mg/5 mL and
the prescription reads 20 mg, it makes sense to administer 10 mL. The nurse should administer
codeine oral solution 10 mL PO every 6 hr PRN pain. 

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