DOSAGE CALCULATIONS MADE
EASY
SOLVING PROBLEMS USING
DIMENSIONAL ANALYSIS
8TH EDITION
• AUTHOR(S)GLORIA PEARL
CRAIG
TEST BANK
,Question 1 (Easy) – Oral Tablet Calculation
A patient is prescribed amoxicillin 500 mg PO. The medication
available is 250 mg/tablet. How many tablets should the nurse
administer?
A. 1 tablet
B. 1.5 tablets
C. 2 tablets
D. 2.5 tablets
Correct Answer: C
Rationale:
Step 1: Identify the ordered and available doses.
Ordered = 500 mg
Available = 250 mg/tablet
Step 2: Set up dimensional analysis.
500 mg×1 tablet250 mg=2 tablets500\
\text{mg}\times\frac{1\ \text{tablet}}{250\ \text{mg}}=2\
\text{tablets}500 mg×250 mg1 tablet=2 tablets
Step 3: The patient requires 2 tablets.
,Medication Safety Note:
Always compare the medication order with the available
strength before administering tablets.
Question 2 (Easy) – Liquid Medication
The provider orders 450 mg of a medication. The bottle is
labeled 300 mg/5 mL. How many milliliters should the nurse
administer?
A. 5 mL
B. 7.5 mL
C. 10 mL
D. 12.5 mL
Correct Answer: B
Rationale:
Step 1:
Available concentration:
300 mg = 5 mL
Step 2:
450 mg×5 mL300 mg=7.5 mL450\ \text{mg}\times\frac{5\
\text{mL}}{300\ \text{mg}}=7.5\
\text{mL}450 mg×300 mg5 mL=7.5 mL
, Step 3:
Administer 7.5 mL.
Medication Safety Note:
Use an oral syringe for accurate measurement of non-integer
liquid doses.
Question 3 (Easy) – Metric Conversion
Convert 2.5 grams to milligrams.
A. 25 mg
B. 250 mg
C. 2,500 mg
D. 25,000 mg
Correct Answer: C
Rationale:
Step 1:
1 g = 1000 mg
Step 2:
2.5 g×1000 mg1 g=2500 mg2.5\ \text{g}\times\frac{1000\
\text{mg}}{1\ \text{g}}=2500\ \text{mg}2.5 g×1 g1000 mg
=2500 mg
EASY
SOLVING PROBLEMS USING
DIMENSIONAL ANALYSIS
8TH EDITION
• AUTHOR(S)GLORIA PEARL
CRAIG
TEST BANK
,Question 1 (Easy) – Oral Tablet Calculation
A patient is prescribed amoxicillin 500 mg PO. The medication
available is 250 mg/tablet. How many tablets should the nurse
administer?
A. 1 tablet
B. 1.5 tablets
C. 2 tablets
D. 2.5 tablets
Correct Answer: C
Rationale:
Step 1: Identify the ordered and available doses.
Ordered = 500 mg
Available = 250 mg/tablet
Step 2: Set up dimensional analysis.
500 mg×1 tablet250 mg=2 tablets500\
\text{mg}\times\frac{1\ \text{tablet}}{250\ \text{mg}}=2\
\text{tablets}500 mg×250 mg1 tablet=2 tablets
Step 3: The patient requires 2 tablets.
,Medication Safety Note:
Always compare the medication order with the available
strength before administering tablets.
Question 2 (Easy) – Liquid Medication
The provider orders 450 mg of a medication. The bottle is
labeled 300 mg/5 mL. How many milliliters should the nurse
administer?
A. 5 mL
B. 7.5 mL
C. 10 mL
D. 12.5 mL
Correct Answer: B
Rationale:
Step 1:
Available concentration:
300 mg = 5 mL
Step 2:
450 mg×5 mL300 mg=7.5 mL450\ \text{mg}\times\frac{5\
\text{mL}}{300\ \text{mg}}=7.5\
\text{mL}450 mg×300 mg5 mL=7.5 mL
, Step 3:
Administer 7.5 mL.
Medication Safety Note:
Use an oral syringe for accurate measurement of non-integer
liquid doses.
Question 3 (Easy) – Metric Conversion
Convert 2.5 grams to milligrams.
A. 25 mg
B. 250 mg
C. 2,500 mg
D. 25,000 mg
Correct Answer: C
Rationale:
Step 1:
1 g = 1000 mg
Step 2:
2.5 g×1000 mg1 g=2500 mg2.5\ \text{g}\times\frac{1000\
\text{mg}}{1\ \text{g}}=2500\ \text{mg}2.5 g×1 g1000 mg
=2500 mg
