Solving Problems Using Dimensional

DOSAGE CALCULATIONS MADE
EASY
SOLVING PROBLEMS USING
DIMENSIONAL ANALYSIS
8TH EDITION
• AUTHOR(S)GLORIA PEARL
CRAIG




TEST BANK

,Question 1 (Easy)
A provider prescribes amoxicillin 500 mg PO. The medication
available is 250 mg capsules.
How many capsules should the nurse administer?
A. 1 capsule
B. 2 capsules
C. 3 capsules
D. 4 capsules
Correct Answer: B. 2 capsules
Rationale:
Step 1: Setup (Dimensional Analysis)
[
500\text{ mg}\times\frac{1\text{ capsule}}{250\text{ mg}}
]
Step 2: Cancel units
mg cancels.
[
=\frac{500}{250}=2\text{ capsules}
]
Step 3: Solution
Administer 2 capsules.

,Medication Safety Note:
Always verify that the ordered dose matches the medication
strength before administering multiple tablets or capsules.


Question 2 (Easy)
A patient is prescribed acetaminophen 650 mg PO.
The suspension available is 160 mg/5 mL.
How many milliliters should the nurse administer?
A. 15.3 mL
B. 20.3 mL
C. 25.0 mL
D. 30.0 mL
Correct Answer: B. 20.3 mL
Rationale:
Step 1
[
650\text{ mg}\times\frac{5\text{ mL}}{160\text{ mg}}
]
Step 2

, [
=\frac{3250}{160}=20.31\text{ mL}
]
Step 3
Round to the nearest tenth:
20.3 mL
Medication Safety Note:
Use an oral dosing syringe for accurate measurement of liquid
medications.


Question 3 (Easy)
Convert 2.5 grams to milligrams.
A. 25 mg
B. 250 mg
C. 2,500 mg
D. 25,000 mg
Correct Answer: C. 2,500 mg
Rationale:
Step 1