Prepare for nursing dosage-calculation assessments with comprehensive practice material based on Calculating Drug Dosages: A Patient-Safe Approach to Nursing and Math, 3rd Edition by Sandra Luz Martinez de Castillo and Maryanne Werner-McCullough.
This resource covers the book's complete 22-chapter structure, progressing from medication-safety principles and measurement systems to dosage-calculation methods, oral and parenteral medications, IV therapy, safe-dose verification, intake and output, and dosage considerations for pediatric and older adult patients.
Complete 22-Chapter Coverage
Unit I – Safety in Medication Administration
Chapter 1 – Safety in Medication Administration
Medication administration safety, medication orders, safe practices, prevention of medication errors, and essential nursing responsibilities.
Chapter 2 – The Drug Label
Reading and interpreting medication labels, identifying drug concentrations, available doses, and information required for accurate calculations.
Unit II – Systems of Measurement
Chapter 3 – The Metric System
Metric units, conversions, decimal relationships, and measurement concepts used in medication calculations.
Chapter 4 – The Household System
Household measurements, conversions, and relationships between household and metric measurements.
Unit III – Methods of Calculation
Chapter 5 – Linear Ratio and Proportion
Ratio-and-proportion calculations for determining medication doses and quantities to administer.
Chapter 6 – Fractional Ratio and Proportion
Fraction-based calculations and application of proportional relationships to medication problems.
Chapter 7 – Dimensional Analysis
Dimensional-analysis techniques, unit cancellation, conversions, and structured dosage calculations.
Chapter 8 – Formula Method
Using medication-calculation formulas to determine required doses accurately.
Unit IV – Administration of Medications
Chapter 9 – Calculating Oral Medication Doses
Oral medications, tablets, capsules, liquid medications, dose conversions, and calculation of doses to administer.
Chapter 10 – Syringes and Needles
Syringe measurements, needle considerations, calibration, and accurate preparation of injectable medications.
Chapter 11 – Calculating Parenteral Medication Dosages
Parenteral dosage calculations, injectable medications, concentrations, and determining the correct volume to administer.
Chapter 12 – Preparing Powdered Parenteral Medications
Reconstitution of powdered medications, determining final concentrations, and calculating doses after reconstitution.
Chapter 13 – Administration of Insulin
Insulin calculations, insulin administration, dose measurement, and safe handling of insulin preparations.
Unit V – IV Therapy and Administration of Intravenous Medications
Chapter 14 – Intravenous Infusion and Infusion Rates
IV infusion calculations, flow rates, infusion equipment, and determining appropriate administration rates.
Chapter 15 – Calculating Infusion and Completion Time
Calculating infusion duration, completion times, volumes, and administration rates.
Chapter 16 – Administering IV Push Medications
IV push medication calculations, concentration, volume, administration rates, and safe medication administration.
Unit VI – Verifying Safe Dose and Critical Care Calculations
Chapter 17 – Verifying Safe Dose
Safe-dose calculations, dose-range verification, identifying potentially unsafe doses, and preventing medication errors.
Chapter 18 – Titration of Intravenous Medications
IV medication titration, dosage adjustments, infusion calculations, and safe management of titrated medications.
Unit VII – Intake and Output
Chapter 19 – Calculating Intake and Output
Measurement and calculation of fluid intake and output, documentation, and clinical interpretation.
Chapter 20 – Calculating Parenteral Intake
Calculating fluid intake from parenteral sources, including IV-related fluid volumes and medication administration.
Unit VIII – Dosages for Pediatric and Older Adult Populations
Chapter 21 – Considerations for the Pediatric Patient
Pediatric dosage calculations, weight-based considerations, safe dosing principles, and medication administration for children.
Chapter 22 – Considerations for the Older Adult
Dosage considerations for older adults, age-related factors, safe medication administration, and calculation considerations.
Key Topics Covered
Medication administration safety
Medication orders and drug labels
Metric and household measurement systems
Measurement conversions
Linear ratio and proportion
Fractional ratio and proportion
Dimensional analysis
Formula-method calculations
Oral medication dosage calculations
Tablets, capsules, and liquid medications
Syringes and needles
Parenteral medication calculations
Reconstitution of powdered medications
Insulin calculations
IV infusion rates
Infusion and completion-time calculations
IV push medications
Safe-dose verification
IV medication titration
Intake and output calculations
Parenteral fluid intake
Pediatric dosage considerations
Older adult dosage considerations
Exam-Focused Practice
The material is structured around the complete 22 chapters, allowing students to work through dosage-calculation concepts progressively—from basic measurement and calculation methods to more advanced IV, safe-dose, pediatric, and older-adult applications. Available previews describe multiple-choice practice questions and calculation-based scenarios covering the chapter material.
This makes the resource useful for:
Nursing dosage-calculation exams
Medication-math practice
Chapter-by-chapter revision
Nursing mathematics coursework
Quiz preparation
Midterm and final examination review
Practice with medication-conversion problems
IV calculation practice
Pediatric and older-adult dosage review
Complete Chapter Coverage
Chapters 1–22 are represented across all eight units, providing a structured review of medication safety, measurement systems, calculation methods, medication administration, IV therapy, safe-dose verification, fluid calculations, and age-specific dosage considerations.
Use this material alongside the textbook, course instruction, and your institution's medication-administration guidelines for study and examination preparation.
Content preview
,Chapter 1: Safety in Medication Administration
Multiple-Choice Questions (1–70)
Question 1: A nurse receives the following medication order: "Digoxin .25 mg PO daily." What is the
nurse's first action?
A) Administer the medication as ordered
B) Clarify the order with the prescribing provider
C) Calculate the dose based on the patient's weight
D) Check the patient's apical pulse before administration
Correct Answer: B
Rationale: The order for digoxin (.25 mg) lacks a leading zero before the decimal point, which is an
unsafe practice that can lead to a tenfold medication error. Safe practice requires a zero before the
decimal point when the dose is less than one (i.e., 0.25 mg). The nurse should clarify the order before
administration.
Question 2: Which of the following represents the safest notation for a medication order of one-half
milligram?
A) .5 mg
B) 0.5 mg
C) ½ mg
D) 5 mg
Correct Answer: B
Rationale: Safe medication notation requires a leading zero before the decimal point (0.5 mg) and
avoidance of trailing zeros. The notation ".5 mg" can be misread as 5 mg. Fractions should not be used in
medication orders.
Question 3: A nurse is preparing to administer a medication and notices the order states "MS 4 mg IV
push." What is the nurse's priority action?
A) Administer the medication as ordered
B) Clarify the order because "MS" is an unsafe abbreviation
C) Administer the medication and document as "MS"
D) Ask another nurse to administer the medication
Correct Answer: B
Rationale: "MS" is an unsafe abbreviation that can mean either morphine sulfate or magnesium sulfate.
The nurse must clarify the order to determine the intended medication before administration.
Question 4: Which of the following is one of the Six Rights of Medication Administration?
A) Right diagnosis
B) Right documentation
C) Right physician
D) Right hospital
,Correct Answer: B
Rationale: The Six Rights of Medication Administration are: Right patient, Right medication, Right dose,
Right route, Right time, and Right documentation.
Question 5: A nurse is calculating a pediatric dose and the calculation results in 0.6666 mL. How should
the nurse round this dose?
A) 0.66 mL
B) 0.67 mL
C) 0.7 mL
D) 0.666 mL
Correct Answer: B
Rationale: For pediatric doses, round to the nearest hundredth (two decimal places) when the dose is
less than 1 mL. 0.6666 rounds to 0.67 mL.
Question 6: A patient is prescribed 0.125 mg of a medication. The pharmacy dispenses tablets labeled
125 mcg. How many tablets should the nurse administer?
A) 0.5 tablet
B) 1 tablet
C) 2 tablets
D) 4 tablets
Correct Answer: B
Rationale: Convert the ordered dose to the same unit as the available medication: 0.125 mg = 125 mcg.
The available tablet is 125 mcg, so the nurse should administer 1 tablet.
Question 7: A nurse is preparing to administer insulin. Which of the following is the correct action?
A) Use a tuberculin syringe to measure insulin
B) Use a standard 3-mL syringe to measure insulin
C) Use an insulin syringe calibrated in units
D) Use a 1-mL syringe calibrated in milliliters
Correct Answer: C
Rationale: Insulin must always be measured using an insulin syringe calibrated in units. Using any other
syringe can result in a medication error.
Question 8: A nurse receives a verbal order from a physician. What is the nurse's priority action?
A) Administer the medication immediately
B) Write down the order and read it back to the physician for verification
C) Ask another nurse to verify the order
D) Document the order after administration
Correct Answer: B
Rationale: When receiving a verbal order, the nurse must write it down and read it back to the
prescriber to verify accuracy. This practice reduces the risk of medication errors.
Question 9: Which of the following is an example of a high-alert medication?
A) Acetaminophen
, B) Insulin
C) Multivitamin
D) Oral rehydration solution
Correct Answer: B
Rationale: Insulin is classified as a high-alert medication because errors with this medication can cause
significant patient harm.
Question 10: A nurse is calculating a dose and obtains a result of 1.5 tablets. What should the nurse do?
A) Administer 1.5 tablets
B) Administer 2 tablets
C) Clarify the order with the prescriber
D) Cut the tablet in half and administer 1.5 tablets
Correct Answer: C
Rationale: If a calculation results in a fraction of a tablet that cannot be accurately administered (i.e., the
tablet does not have a score line), the nurse should clarify the order with the prescriber.
Question 11: What is the primary purpose of the Six Rights of Medication Administration?
A) To reduce the cost of medications
B) To prevent medication errors
C) To speed up medication administration
D) To reduce documentation requirements
Correct Answer: B
Rationale: The Six Rights of Medication Administration are a safety framework designed to prevent
medication errors.
Question 12: A nurse is preparing to administer a medication via nasogastric tube. Which of the
following is the correct action?
A) Administer the medication as a tablet
B) Crush the medication and mix with water
C) Administer the medication with food
D) Use a suppository form instead
Correct Answer: B
Rationale: Medications administered via nasogastric tube must be in liquid form or crushed and mixed
with water. Enteric-coated and sustained-release medications should not be crushed.
Question 13: A nurse is reviewing a medication order that reads "10.0 mg." What is the nurse's concern
with this order?
A) The dose is too high
B) The trailing zero is unsafe
C) The dose is too low
D) The medication is not appropriate