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TI RN Pharmacology Dosage Calculation
A
Practice Exam 2025 – NGN-Ready Questions &
Answers in Full with Rationales | 100%
Verified | Graded A+
Student Name: ______________________
Date: _______________
Time Limit: 75 minutes
Total Questions: 50
Section 1: Oral Medication Calculations (15 Questions)
1. A client is prescribed amoxicillin 500 mg PO every 8 hours. The pharmacy provides 250 mg
capsules. How many capsules should the nurse administer per dose?
A. 1 capsule
B. ==2 capsules==
C. 3 capsules
D. 4 capsules
Calculation:
(500 mg / dose) ÷ (250 mg / capsule) = 2 capsules
Rationale:Dividing the prescribed dose (500 mg)by the available dose per capsule (250 mg)
yields 2 capsules per dose. No rounding is needed as the result is a whole number.
2. A client is ordered acetaminophen 650 mg PO every 6 hours. The elixir available is 160
mg/5 mL. How many mL should the nurse administer per dose?
A. 10 mL
B. ==20.31 mL==
C. 25 mL
D. 30 mL
Calculation:
(650 mg / dose) × (5 mL / 160 mg) = (650 × 5) ÷ 160 = 3250 ÷ 160 = 20.31 mL
Rationale:Using dimensional analysis, multiply theprescribed dose by the mL per mg ratio.
, he result, 20.31 mL, is rounded to two decimal places per medication safety standards for liquid
T
doses.
3. A client is prescribed prednisone 40 mg PO daily. The pharmacy provides 10 mg tablets.
How many tablets should the nurse administer?
A. 2 tablets
B. 3 tablets
C. ==4 tablets==
D. 5 tablets
Calculation:
(40 mg / dose) ÷ (10 mg / tablet) = 4 tablets
Rationale:Dividing the prescribed dose by the availabledose per tablet gives 4 tablets, a whole
number requiring no rounding.
4. NGN Case Study: A client with hypertension is prescribed lisinopril 20 mg PO daily. The
pharmacy provides 5 mg tablets. The nurse calculates the dose. Which action demonstrates
medication safety?
A. Administer 2 tablets
B. ==Administer 4 tablets and document the calculation==
C. Administer 5 tablets
D. Consult the provider to change the dose
Calculation:
(20 mg / dose) ÷ (5 mg / tablet) = 4 tablets
Rationale:The correct dose is 4 tablets. Documentingthe calculation ensures compliance with
medication safety protocols, reducing errors.
5. A client is ordered digoxin 0.125 mg PO daily. The available tablets are 0.25 mg. How many
tablets should the nurse administer?
A. ==0.5 tablet==
B. 1 tablet
C. 1.5 tablets
D. 2 tablets
Calculation:
(0.125 mg / dose) ÷ (0.25 mg / tablet) = 0.5 tablet
Rationale:Dividing the prescribed dose by the availabledose per tablet yields 0.5 tablet.
Digoxin tablets can be scored for splitting, ensuring accurate dosing.
6. A client is prescribed ibuprofen 600 mg PO every 8 hours. The suspension available is 100
mg/5 mL. How many mL should the nurse administer per dose?
A. 15 mL
B. ==30 mL==
C. 45 mL
D. 60 mL
Calculation:
(600 mg / dose) × (5 mL / 100 mg) = (600 × 5) ÷ 100 = 3000 ÷ 100 = 30 mL
Rationale:The calculation results in 30 mL, an exact whole number, requiring no rounding for
liquid administration.
TI RN Pharmacology Dosage Calculation
A
Practice Exam 2025 – NGN-Ready Questions &
Answers in Full with Rationales | 100%
Verified | Graded A+
Student Name: ______________________
Date: _______________
Time Limit: 75 minutes
Total Questions: 50
Section 1: Oral Medication Calculations (15 Questions)
1. A client is prescribed amoxicillin 500 mg PO every 8 hours. The pharmacy provides 250 mg
capsules. How many capsules should the nurse administer per dose?
A. 1 capsule
B. ==2 capsules==
C. 3 capsules
D. 4 capsules
Calculation:
(500 mg / dose) ÷ (250 mg / capsule) = 2 capsules
Rationale:Dividing the prescribed dose (500 mg)by the available dose per capsule (250 mg)
yields 2 capsules per dose. No rounding is needed as the result is a whole number.
2. A client is ordered acetaminophen 650 mg PO every 6 hours. The elixir available is 160
mg/5 mL. How many mL should the nurse administer per dose?
A. 10 mL
B. ==20.31 mL==
C. 25 mL
D. 30 mL
Calculation:
(650 mg / dose) × (5 mL / 160 mg) = (650 × 5) ÷ 160 = 3250 ÷ 160 = 20.31 mL
Rationale:Using dimensional analysis, multiply theprescribed dose by the mL per mg ratio.
, he result, 20.31 mL, is rounded to two decimal places per medication safety standards for liquid
T
doses.
3. A client is prescribed prednisone 40 mg PO daily. The pharmacy provides 10 mg tablets.
How many tablets should the nurse administer?
A. 2 tablets
B. 3 tablets
C. ==4 tablets==
D. 5 tablets
Calculation:
(40 mg / dose) ÷ (10 mg / tablet) = 4 tablets
Rationale:Dividing the prescribed dose by the availabledose per tablet gives 4 tablets, a whole
number requiring no rounding.
4. NGN Case Study: A client with hypertension is prescribed lisinopril 20 mg PO daily. The
pharmacy provides 5 mg tablets. The nurse calculates the dose. Which action demonstrates
medication safety?
A. Administer 2 tablets
B. ==Administer 4 tablets and document the calculation==
C. Administer 5 tablets
D. Consult the provider to change the dose
Calculation:
(20 mg / dose) ÷ (5 mg / tablet) = 4 tablets
Rationale:The correct dose is 4 tablets. Documentingthe calculation ensures compliance with
medication safety protocols, reducing errors.
5. A client is ordered digoxin 0.125 mg PO daily. The available tablets are 0.25 mg. How many
tablets should the nurse administer?
A. ==0.5 tablet==
B. 1 tablet
C. 1.5 tablets
D. 2 tablets
Calculation:
(0.125 mg / dose) ÷ (0.25 mg / tablet) = 0.5 tablet
Rationale:Dividing the prescribed dose by the availabledose per tablet yields 0.5 tablet.
Digoxin tablets can be scored for splitting, ensuring accurate dosing.
6. A client is prescribed ibuprofen 600 mg PO every 8 hours. The suspension available is 100
mg/5 mL. How many mL should the nurse administer per dose?
A. 15 mL
B. ==30 mL==
C. 45 mL
D. 60 mL
Calculation:
(600 mg / dose) × (5 mL / 100 mg) = (600 × 5) ÷ 100 = 3000 ÷ 100 = 30 mL
Rationale:The calculation results in 30 mL, an exact whole number, requiring no rounding for
liquid administration.
