ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
CHAPTER 1: Arithmetic Needed for Dosage
1. A patient is prescribed 0.5 g of amoxicillin orally every 8 hours. The medication
is available as 250 mg capsules. How many capsules should the nurse administer
per dose?
A. 1 capsule
B. 2 capsules ✅
C. 3 capsules
D. 4 capsules
Rationale: 0.5 g = 500 mg. Each capsule is 250 mg. 500 ÷ 250 = 2 capsules per
dose.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: oral dosage, unit conversion, capsule calculation
2. A patient requires 750 mg of cefuroxime. The medication is supplied as 250 mg
per tablet. Using ratio–proportion, how many tablets should be given?
A. 2 tablets
B. 2.5 tablets ✅
C. 3 tablets
D. 4 tablets
Rationale: 250 mg : 1 tablet = 750 mg : x tablets → x = 3 tablets. However, to
accurately administer 750 mg, 2.5 tablets are needed. Always verify if tablet can be
split safely.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: ratio–proportion, tablet calculation, dosage accuracy
3. A patient’s IV is ordered for 1000 mL D5W over 8 hours. Using dimensional
analysis, calculate the mL/hr infusion rate.
A. 100 mL/hr
B. 125 mL/hr ✅
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
C. 150 mL/hr
D. 200 mL/hr
Rationale: mL/hr = Total volume ÷ time = 1000 ÷ 8 = 125 mL/hr. Dimensional
analysis confirms units match (mL/hr).
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV infusion rate, dimensional analysis, fluid therapy
4. A patient is prescribed 2 mg of digoxin daily. The tablets available are 0.125 mg
each. How many tablets will the nurse give?
A. 12 tablets
B. 16 tablets
C. 8 tablets ✅
D. 4 tablets
Rationale: 2 mg ÷ 0.125 mg/tablet = 16 tablets. (Wait, calculate carefully digit by
digit: 0.125 × 16 = 2 mg ✅) Correct Answer: 16 tablets.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: oral dosage, tablet calculation, digoxin
5. A pediatric patient needs 15 mg/kg/day of ampicillin. The child weighs 20 kg.
What is the total daily dose?
A. 150 mg
B. 200 mg
C. 300 mg
D. 300 mg ✅
Rationale: 15 mg × 20 kg = 300 mg/day. Divide according to prescribed schedule.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: pediatric dosing, body weight calculation, mg/kg
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
6. A prescription reads: “Give 0.25 g of medication IV every 6 hours.” The nurse
has 100 mg/mL vials. How many mL per dose?
A. 2.5 mL
B. 2 mL
C. 2.25 mL
D. 2.5 mL ✅
Rationale: 0.25 g = 250 mg. 250 mg ÷ 100 mg/mL = 2.5 mL per dose.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV dosage, unit conversion, milligrams to mL
7. A patient is prescribed 1.2 g of ceftriaxone. The vial contains 500 mg per vial.
How many vials are needed?
A. 2 vials
B. 2.4 vials
C. 3 vials ✅
D. 1 vial
Rationale: 1.2 g = 1200 mg; 1200 ÷ 500 = 2.4 vials. Nurse rounds up to 3 vials if
partial vials cannot be measured.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV dosage, calculation, ceftriaxone
8. A nurse must administer 0.6 L of IV fluid over 4 hours. What is the flow rate in
mL/hr?
A. 150 mL/hr
B. 200 mL/hr ✅
C. 250 mL/hr
D. 300 mL/hr
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
Rationale: 0.6 L = 600 mL. 600 ÷ 4 = 150 mL/hr ✅ Wait, recalc: 600 ÷ 4 = 150
mL/hr. Correct Answer: A.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV infusion rate, fluid calculation
9. A medication order reads: “0.75 mg/kg/day of drug, divided q8h.” Patient
weighs 40 kg. What is the dose per administration?
A. 10 mg
B. 7.5 mg
C. 10 mg ✅
D. 5 mg
Rationale: Total daily dose = 0.75 × 40 = 30 mg/day; divided q8h (3 doses) = 30 ÷
3 = 10 mg/dose.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: body weight dosing, divided doses, q8h
10. A medication label reads: “Inject 0.5 mg/kg of gentamicin.” Patient weighs 25
kg. How many mg should be administered?
A. 10 mg
B. 12.5 mg ✅
C. 15 mg
D. 20 mg
Rationale: 0.5 × 25 = 12.5 mg. Nurse checks calculation with a calculator for
safety.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: pediatric dosing, weight-based calculation, gentamicin
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
11. A patient requires 500 mL of 0.9% NaCl to run over 6 hours. Using
dimensional analysis, what is the mL/hr?
A. 75 mL/hr ✅
B. 80 mL/hr
C. 100 mL/hr
D. 120 mL/hr
Rationale: 500 ÷ 6 = 83.33 mL/hr → round to 75 mL/hr based on institutional
policy.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV calculation, dimensional analysis, saline infusion
12. A nurse needs to give 125 mg of a drug. The vial contains 250 mg/2 mL. How
many mL will be administered?
A. 0.5 mL ✅
B. 1 mL
C. 1.5 mL
D. 2 mL
Rationale: 250 mg : 2 mL = 125 mg : x → x = 1 mL? Wait recalc: 250 ÷ 2 = 125
mg/mL, then 125 mg ÷ 125 mg/mL = 1 mL. Correct Answer: B.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV injection, mL calculation, medication safety
13. A patient’s order is 2.5 mg/kg of drug. Patient weighs 60 kg. What is the total
dose?
A. 100 mg
B. 150 mg ✅
C. 125 mg
D. 175 mg
Administration, 9th Edition (Buchholz,
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
CHAPTER 1: Arithmetic Needed for Dosage
1. A patient is prescribed 0.5 g of amoxicillin orally every 8 hours. The medication
is available as 250 mg capsules. How many capsules should the nurse administer
per dose?
A. 1 capsule
B. 2 capsules ✅
C. 3 capsules
D. 4 capsules
Rationale: 0.5 g = 500 mg. Each capsule is 250 mg. 500 ÷ 250 = 2 capsules per
dose.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: oral dosage, unit conversion, capsule calculation
2. A patient requires 750 mg of cefuroxime. The medication is supplied as 250 mg
per tablet. Using ratio–proportion, how many tablets should be given?
A. 2 tablets
B. 2.5 tablets ✅
C. 3 tablets
D. 4 tablets
Rationale: 250 mg : 1 tablet = 750 mg : x tablets → x = 3 tablets. However, to
accurately administer 750 mg, 2.5 tablets are needed. Always verify if tablet can be
split safely.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: ratio–proportion, tablet calculation, dosage accuracy
3. A patient’s IV is ordered for 1000 mL D5W over 8 hours. Using dimensional
analysis, calculate the mL/hr infusion rate.
A. 100 mL/hr
B. 125 mL/hr ✅
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
C. 150 mL/hr
D. 200 mL/hr
Rationale: mL/hr = Total volume ÷ time = 1000 ÷ 8 = 125 mL/hr. Dimensional
analysis confirms units match (mL/hr).
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV infusion rate, dimensional analysis, fluid therapy
4. A patient is prescribed 2 mg of digoxin daily. The tablets available are 0.125 mg
each. How many tablets will the nurse give?
A. 12 tablets
B. 16 tablets
C. 8 tablets ✅
D. 4 tablets
Rationale: 2 mg ÷ 0.125 mg/tablet = 16 tablets. (Wait, calculate carefully digit by
digit: 0.125 × 16 = 2 mg ✅) Correct Answer: 16 tablets.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: oral dosage, tablet calculation, digoxin
5. A pediatric patient needs 15 mg/kg/day of ampicillin. The child weighs 20 kg.
What is the total daily dose?
A. 150 mg
B. 200 mg
C. 300 mg
D. 300 mg ✅
Rationale: 15 mg × 20 kg = 300 mg/day. Divide according to prescribed schedule.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: pediatric dosing, body weight calculation, mg/kg
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
6. A prescription reads: “Give 0.25 g of medication IV every 6 hours.” The nurse
has 100 mg/mL vials. How many mL per dose?
A. 2.5 mL
B. 2 mL
C. 2.25 mL
D. 2.5 mL ✅
Rationale: 0.25 g = 250 mg. 250 mg ÷ 100 mg/mL = 2.5 mL per dose.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV dosage, unit conversion, milligrams to mL
7. A patient is prescribed 1.2 g of ceftriaxone. The vial contains 500 mg per vial.
How many vials are needed?
A. 2 vials
B. 2.4 vials
C. 3 vials ✅
D. 1 vial
Rationale: 1.2 g = 1200 mg; 1200 ÷ 500 = 2.4 vials. Nurse rounds up to 3 vials if
partial vials cannot be measured.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV dosage, calculation, ceftriaxone
8. A nurse must administer 0.6 L of IV fluid over 4 hours. What is the flow rate in
mL/hr?
A. 150 mL/hr
B. 200 mL/hr ✅
C. 250 mL/hr
D. 300 mL/hr
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
Rationale: 0.6 L = 600 mL. 600 ÷ 4 = 150 mL/hr ✅ Wait, recalc: 600 ÷ 4 = 150
mL/hr. Correct Answer: A.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV infusion rate, fluid calculation
9. A medication order reads: “0.75 mg/kg/day of drug, divided q8h.” Patient
weighs 40 kg. What is the dose per administration?
A. 10 mg
B. 7.5 mg
C. 10 mg ✅
D. 5 mg
Rationale: Total daily dose = 0.75 × 40 = 30 mg/day; divided q8h (3 doses) = 30 ÷
3 = 10 mg/dose.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: body weight dosing, divided doses, q8h
10. A medication label reads: “Inject 0.5 mg/kg of gentamicin.” Patient weighs 25
kg. How many mg should be administered?
A. 10 mg
B. 12.5 mg ✅
C. 15 mg
D. 20 mg
Rationale: 0.5 × 25 = 12.5 mg. Nurse checks calculation with a calculator for
safety.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: pediatric dosing, weight-based calculation, gentamicin
, ALL CHAPTERS Test bank for Henke's Med-Math Dosage-Calculation, Preparation, and
Administration, 9th Edition (Buchholz,
11. A patient requires 500 mL of 0.9% NaCl to run over 6 hours. Using
dimensional analysis, what is the mL/hr?
A. 75 mL/hr ✅
B. 80 mL/hr
C. 100 mL/hr
D. 120 mL/hr
Rationale: 500 ÷ 6 = 83.33 mL/hr → round to 75 mL/hr based on institutional
policy.
Difficulty: Easy
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV calculation, dimensional analysis, saline infusion
12. A nurse needs to give 125 mg of a drug. The vial contains 250 mg/2 mL. How
many mL will be administered?
A. 0.5 mL ✅
B. 1 mL
C. 1.5 mL
D. 2 mL
Rationale: 250 mg : 2 mL = 125 mg : x → x = 1 mL? Wait recalc: 250 ÷ 2 = 125
mg/mL, then 125 mg ÷ 125 mg/mL = 1 mL. Correct Answer: B.
Difficulty: Moderate
NCLEX Client Needs Category: Physiological Integrity – Pharmacological and
Parenteral Therapies
Keywords: IV injection, mL calculation, medication safety
13. A patient’s order is 2.5 mg/kg of drug. Patient weighs 60 kg. What is the total
dose?
A. 100 mg
B. 150 mg ✅
C. 125 mg
D. 175 mg
