Drug Dosage Calculations
Exam Practice Tests
Course Introduction
Drug Dosage Calculations is a foundational course designed to equip students with the mathematical skills and clinical reasoning necessary to accurately calculate medication dosages in a healthcare setting. The course covers essential topics such as units of measurement, conversions between metric, apothecary, and household systems, calculating oral and parenteral medication dosages, intravenous flow rates, and pediatric calculations. Through practical exercises and case studies, students develop proficiency in dosage calculation techniques, error prevention, and safe medication administration practices, ensuring competency and confidence in delivering safe patient care.
Recommended Textbook
Calculation of Drug Dosages A Work Text 10th Edition by Ogden
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16 Chapters
474 Verified Questions
474 Flashcards
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2
Chapter 1: Fractions
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Sample Questions
Q1) 1 5/6 + 3 1/3 + ____________________ Answer: 5 1/6
Q2) 4 3/10 ÷ 1 3/4 = ____________________ Answer: 2 16/35
Q3) 11/12 - 1/2 = ____________________ Answer: 5/12
Q4) 3/10 + 3/5 + ____________________ Answer: 9/10
Q5) 3 1/2 ÷ 1 1/3 = ____________________ Answer: 2 5/8
Q6) 6 1/2 - 1 3/4 = ____________________ Answer: 4 3/4
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3
Chapter 2: Decimals
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Sample Questions
Q1) 4.4 ÷ 0.5 = ____________________ Answer: 8.8
Q2) 2.67 + 5.1 + 1.3 + 0.9 = ____________________ Answer: 9.97
Q3) 17.5 * 10 = ____________________ Answer: 175
Q4) 354.6 ÷ 1000 = ____________________ Answer: 0.3546
Q5) 110.5 ÷ 7.52 = ____________________ Answer: 14.69414894
Q6) 44.7 * 17.13 * 60 = ____________________ Answer: 45,942.66
Q7) 5.32 * 67.9 = _________ Answer: 361.228
Q8) 16.75 - 4.6 = ____________________ Answer: 12.15
Q9) 120.005 - 95.88 = ____________________ Answer: 24.125
Q10) 258.7 ÷ 100 = ____________________ Answer: 2.587 Page 4
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Page 5
Chapter 3: Percents
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Sample Questions
Q1) What is 25% of 75? ____________________ Answer: 18.75
Q2) Change 67.9% to a decimal. ____________________ Answer: 0.679
Q3) Change 1/4 to a percent. ____________________ Answer: 25%
Q4) Change 1.57 to a percent. ____________________ Answer: 157%
Q5) Change 44% to a proper fraction. ____________________ Answer: 11/25
Q6) What percent of 400 is 125? ____________________ Answer: 31.25%
Q7) Change 7/16 to a percent. ____________________ Answer: 43 3/4%
Q8) Change 0.77 to a percent. ____________________ Answer: 77%
Q9) What is 15% of 1085.6? _____________________ Answer: 162.84
Q10) What percent of 150 is 75? ____________________ Answer: 50% Page 6
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Page 7
Chapter 4: Ratios
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Sample Questions
Q1) Change 44:88 to a percent. ____________________
Q2) Change 15:75 to a percent. ____________________
Q3) Change 2/7% to a ratio. ____________________
Q4) Change 3/8 ÷ 5/12 to a ratio. ____________________
Q5) Change 35:14 to a decimal number. ____________________
Q6) Change 1.66 to a ratio. ____________________
Q7) Change 7:20 to a decimal number. ____________________
Q8) Change 27% to a ratio. ____________________
Q9) Change 3/10:2/5 to a fraction. ____________________
Q10) Change 25:100 to a fraction. ____________________
Q11) Change 1/7 ÷ 4/21 to a ratio. ____________________
Q12) Change 0.12 to a ratio. ____________________
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8
Chapter 5: Proportions
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10 Flashcards
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Sample Questions
Q1) 33% : 66 :: x% : 15 ____________________
Q2) 30 : 600 :: x : 150 ____________________
Q3) x : 0.54 :: 0.6 : 0.8 ____________________
Q4) 25 : 40 :: 75.5 : x ____________________
Q5) x : 0.7 :: 21.21 : 3 ____________________
Q6) x : 1/4 :: 3/4: 32 ____________________
Q7) 2/3 : x :: 8/9 : 12 ____________________
Q8) 16 : x :: 45 : 15____________________
Q9) 14 : x :: 28 : 7 ____________________
Q10) 125 : 20 :: 300 : x ____________________
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Chapter 6: Metric and Household Measurements
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20 Flashcards
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Sample Questions
Q1) 18 mg = ________ mcg
Q2) 2.5 L = ____________________ mL
Q3) 3 oz = _____ mL
Q4) 3.36 cm = ____________________ mm
Q5) 90 kg = ____________________ lb
Q6)
Q7)
Q8)
Q9) 12.6 cm = _____________________
Q10) 15 mg = _________ g
Q11) 112.2 lb = ____________________ kg
Q12) 1 mg = _________ mcg
Q13) 9415 mcg = ____________________ mg
Q14) 1 g = __________ mg
Q15) 1 mg = _________ g
Q16) 1 g = ___________ mcg Page 10
750 mL = ____________________ L
Q18) 1.42 mg = ____________________ mcg
Q19) 76 mg = ____________________ mcg
Q20) 17.4 kg = ____________________ g
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Chapter 7: Calculations Used in Patient Assessments
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44 Flashcards
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Sample Questions
Q1) 2.5 L = ____________________ mL
Q2) 112.2 lb = ____________________ kg
Q3) 3/4 cup = ____________________ fl oz
Q4) 6 cm = ____________________ in
Q5) Calculate the intake.
A patient consumes 120 mL of orange juice and 120 mL of milk for breakfast, 260 mL of coffee for lunch, and 90 mL of an ice pop and 120 mL of ice cream for dinner. The patient voided three times during the shift for 240 mL, 500 mL, and 400 mL. Calculate the intake for the 6 AM to 6 PM shift.
Q6) 12.6 cm = _____________________ in
Q7) 1 g = __________ mg
Q8) 4200 g = ______ kg
Q9) 20 kg = ____________________ lb
Q10) Calculate the output.
A patient consumes 2 oz of an ice pop and 30 mL of ice chips during the shift. Intravenous fluids infused at 125 mL/h during the shift. The Foley catheter was emptied of 800 mL at 6 PM. A drain was emptied of 80 mL at 6 PM. Calculate the output for the 6 AM to 6 PM shift.
Q11) 76 mg = ____________________ mcg Page 12
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Chapter 11: Oral Dosages
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105 Flashcards
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Sample Questions
Q1) The physician has ordered Digitek 0.125 mg oral every 48 hours for a patient with atrial fibrillation. The medication is supplied as Digitek 125 mcg per tablet. How many tablets of Digitek would the patient receive with each dose? _________
Q2) The physician orders guaifenesin 600 mg oral every 6 hours. Guaifenesin 200 mg is available in 200 mg/10 mL. How many milliliters would the nurse administer with each dose? ___________
Q3) The physician orders ascorbic acid 600 mg oral daily for a patient with anemia. Ascorbic acid is available in 300-mg tablets. How many tablets would the nurse administer with each dose? ___________
Q4) A patient with GERD has Reglan 5 mg every 6 hours per gastric tube ordered. The Reglan syrup is supplied in a 10 mg per 10-mL concentration. How many milliliters would the nurse administer with each dose? ___________
Q5) The physician orders Cytomel 50 mg daily. The medication is supplied as Cytomel 25-mg tablets. How many tablets of Cytomel would the patient receive with each dose?
Q6) A patient with GERD has omeprazole 20 mg twice a day ordered. The omeprazole is supplied in 20-mg capsules. How many capsules would the nurse administer with each dose? _________
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Chapter 12: Parenteral Dosages
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Sample Questions
Q1) A patient has an order for metoclopramide 5 mg IV every 6 hours for a patient with high gastric residuals. Using a vial with a 10 mg/mL concentration, how many milliliters would be administered with each dose? ____________
Q2) The physician orders KCl 10 mEq in 1000 mL of D<sub>5</sub> NS to infuse at 100 mL/h. Available: 10 mEq/5 mL. How many milliliters of KCl will the nurse add to the IV?
Q3) Arixtra 5 mg subcutaneous every morning is ordered for deep vein thrombosis prevention. The medication is available in 5 mg per 0.4-mL vials. How many milliliters would the nurse administer with each dose? __________
Q4) A patient with anemia has Epogen 5000 units subcutaneous every Monday. The medication is supplied in 10,000 units per 1-mL vials. How many milliliters would the nurse administer with each dose? __________
Q5) According to the heparin protocol, a patient is to receive 80 units per kg IV before the continuous heparin infusion is started. For a patient weighing 75 kg, how many units of heparin should be administered? _________ Using a concentration of 1000 units/mL, how many milliliters of heparin should be administered? _______
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15
Chapter 13: Dosages Measured in Units
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Sample Questions
Q1) The physician orders heparin 5500 units subcutaneous for deep vein thrombosis prevention. The medication is supplied in 10,000 units/mL. How many milliliters will the nurse administer? ____________________
Q2) The physician orders heparin 5000 units subcutaneous every 12 hours for a patient with a deep vein thrombosis. The heparin is available in 20,000 units per 1-mL concentration. How many milliliters would the nurse administer with each dose?
Q3) A patient has orders for Fragmin 2500 international units twice a day for deep vein thrombosis prevention. The Fragmin is available in 5000 international units per 0.4 milliliter vials. How many milliliters would the nurse administer with each dose?
Q4) Heparin 10,000 units subcutaneous every 12 hours is ordered for a patient after a stent placement. The heparin is available in 20,000 units per 1-mL concentration. How many milliliters would the nurse administer with each dose? __________
Q5) A patient has orders for Fragmin 10,000 international units twice a day for deep vein thrombosis prevention. The Fragmin is available in 5000 international units per 0.4 milliliter vials. How many milliliters would the nurse administer with each dose?
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Chapter 14: Reconstitution of Medications
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Sample Questions
Q1) The physician orders Ancef 500 mg IV for a urinary tract infection. After reconstitution, the medication is available as 330 mg/mL. How many milliliters will the nurse administer?
Q2) The physician orders Pfizerpen 750,000 units IV for an upper respiratory infection. After reconstitution, the medication is available as 500,000 units/mL. How many milliliters will the nurse administer?
Q3) The physician orders Amoxil 200 mg po for a sinus infection. After the reconstitution, the medication is available as 125 mg/5 mL. How many milliliters will the nurse administer?
Q4) The physician orders penicillin G 350,000 units IM for an infection. After reconstitution, the medication is available as 200,000 units/mL. How many milliliters will the nurse administer?
Q5) The physician orders Vancocin 375 mg po for a staph infection. After reconstitution, the medication is available as 250 mg/5 mL. How many milliliters will the nurse administer?
Q6) The physician orders Lorabid 350 mg po for pneumonia. After reconstitution, the medication is available as 200 mg/5 mL. How many milliliters will the nurse administer?
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Page 17
Chapter 15: Intravenous Flow Rates
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Sample Questions
Q1) A patient on a ventilator has an order for a continuous Ativan drip at 2 mg/h. The Ativan concentration is 0. 2 mg/mL. Using an IV controller, how many milliliters per hour should the Ativan be infused? ___________
Q2) The patient has vancomycin 1250 mg ordered IV once daily for an infection. The vancomycin is available in 250 mL of NS and should infuse over 2 hours. Using tubing with a 20 gtt/mL drop factor, how many drops per minute should the vancomycin be infused? __________
Q3) Zosyn 4.5 g IV once a day is ordered for a patient. The Zosyn is dissolved in 100 mL of NS and should infuse over 4 hours. Using an IV controller, how many milliliters per hour should the Zosyn be infused? ___________
Q4) Lactated Ringer's solution 12,500 mL is to be infused in a burn patient over 8 hours. How many milliliters per hour should the IV fluids be infused? ___________
Q5) A patient on a ventilator has an order for a continuous Versed drip at 2 mg/h. The Versed concentration is 50 mg/50 mL of NS. Using an IV controller, how many milliliters per hour should the Versed be infused? ___________
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Chapter 16: Intravenous Flow Rates for Dosages Measured
in Units
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Sample Questions
Q1) Calculate the milliliters per hour of heparin required for the continuous infusion.
Order: Begin a heparin drip per the facility's protocol. The patient's weight is 80 kg.
Heparin Protocol
Bolus: Heparin 80 units/kg
Infusion: Heparin 18 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL)
Q2) Calculate the units of heparin required for the bolus dose. Round the final answer to the nearest hundredth place.
Order: Begin a heparin drip per the facility's protocol. The patient's weight is 80 kg.
Heparin Protocol
Bolus: Heparin 80 units/kg
Infusion: Heparin 18 units/kg/h using a concentration of heparin 25,000 units in 250 mL of NS (100 units/mL)
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19
Chapter 17: Critical Care Intravenous Flow Rates
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Sample Questions
Q1) Round your answer to the nearest whole number. A patient with an allergy to heparin has orders for argatroban at 2 mcg/kg/min. The patient's weight is 125 kg. The argatroban is available in a 125 mg/125 mL concentration. How many milliliters per hour should the argatroban infuse? _______
Q2) Round your answer to the nearest tenth. A patient with septic shock has a Neo-Synephrine drip infusing at 20 mL/h. The Neo-Synephrine concentration is 50 mg in 250 mL of NS. How many micrograms per minute is the patient receiving? _________________
Q3) Round your answer to the nearest whole number.
During your morning assessment, you note that a patient with ventricular tachycardia has a lidocaine drip infusing at 45 mL/h. With a concentration of lidocaine 2 g/250 mL D<sub>5</sub>W, how many milligrams per minute is the patient receiving?
Q4) Round your answer to the nearest whole number. The physician orders procainamide IV drip at 3 mg/min for premature ventricular contractions. The medication is supplied in 2 g/500 mL of NS. Calculate the flow rate in milliliters per hour. ____________________
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Chapter 18: Pediatric Dosages
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Sample Questions
Q1) The recommended dosage of Dilantin for a child is 7 mg/kg/24 h given q12 h. The child's weight is 55 lb. The medication is supplied in 125 mg/5 mL.
a. What is the child's weight in kilograms? _____________
b. Calculate the safe dose for this child. ____________________
c. How many milliliters will be administered for each dose? ____________________
Q2) The recommended dose of Lasix for a child is 1 mg/kg/dose. The child's weight is 77
lb. The medication is supplied in 10 mg/mL.
a. What is the child's weight in kilograms? _____________
b. Calculate the safe dose for this child. ____________________
c. How many milliliters will be administered for each dose? ____________________
Q3) The physician orders vancomycin 400 mg oral every 6 hours for a child weighing 90
lb. The vancomycin is available in a 250 mg/5 mL concentration. The recommended dose is 40 mg/kg/24 h divided in four divided doses.
a. What is the child's weight in kilograms? _____________
b. How many milligrams per kilogram per 24 hours is the patient receiving?
c. Is the order safe? ___________________
d. If yes, how many milliliters are needed for each dose? ______________
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Chapter 19: Obstetric Dosages
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Sample Questions
Q1) Round the answer to the nearest tenth.
A physician writes orders for 1 g/h of magnesium sulfate for a patient in labor. The medication comes premixed with 40 g magnesium sulfate in 500 mL of lactated Ringer's solution. The IV pump should be programmed for how many milliliters per hour?
Q2) Round the answer to the nearest whole number.
A physician writes orders to increase a magnesium sulfate drip to 2 g/h for a patient in labor. The medication has a concentration of 20 g magnesium sulfate in 100 mL of lactated Ringer's solution. The IV pump should be programmed for how many milliliters per hour? ________
Q3) Round the answer to the nearest whole number.
During shift report, the nurse states that a patient is receiving a Pitocin drip at 11 milliunits per minute. The Pitocin concentration is 30 units in 500 mL of lactated Ringer's solution. The IV pump should be set for how many milliliters per hour? _____________
Q4) Round the answer to the nearest whole number.
The physician leaves orders to infuse Pitocin IV drip at 0.96 units/h. The medication is supplied in 15 units/250 mL of D<sub>5</sub>W. Calculate the flow rate in milliliters per hour. __________
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Page 22