ACTUAL QUESTIONS AND CORRECT ANSWERS WITH
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Medication Safety & Calculations
Question 1
A patient has been prescribed morphine 8mg 2-3 hourly PRN for pain. Unit
stock of morphine is 10mg/1mL. How much morphine should be drawn up
for the patient?
A. 0.08mL
B. 0.25mL
C. 0.75mL
D. 0.80mL
Correct Answer: D. 0.80mL
Rationale: Using the formula: (Desired dose / Stock strength) × Volume =
(8mg / 10mg) × 1mL = 0.8mL. Always double-check calculations for opioids
due to the high risk of errors.
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Question 2
A child weighs 22.4kg and the prescription is for 24mg/kg of body weight.
The medication comes at the strength of 50mg/mL. How many mL (to one
decimal place) should the child receive?
A. 7.5mL
B. 8.5mL
C. 9.8mL
D. 10.8mL
Correct Answer: D. 10.8mL
Rationale: Total dose = 22.4kg × 24mg/kg = 537.6mg. Volume = 537.6mg ÷
50mg/mL = 10.752mL, rounded to 10.8mL .
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Question 3
Ondansetron 2mg has been prescribed for a child who weighs 13.6kg. The
safe dosage is 0.15mg/kg. Is 2mg a safe dose?
,A. No, a safe dose would be 0.3mg
B. No, a safe dose would be 0.6mg
C. No, a safe dose would be 1.02mg
D. Yes, 2mg is a safe dose
Correct Answer: D. Yes, 2mg is a safe dose
Rationale: Safe dose = 13.6kg × 0.15mg/kg = 2.04mg. The prescribed dose
of 2mg is within the safe range (2.04mg is essentially 2mg) .
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Question 4
A patient is prescribed 250mg of antibiotics in 200mL of intravenous fluid
over 30 minutes. What rate in mL per hour should be set on the infusion
device?
A. 100mL per hour
B. 200mL per hour
C. 400mL per hour
D. 500mL per hour
Correct Answer: C. 400mL per hour
, Rationale: If 200mL is to be given over 30 minutes, the rate for a full hour
would be 200mL × 2 = 400mL/hour .
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Question 5
How many mg is 5000mcg?
A. 0.5mg
B. 5mg
C. 50mg
D. 500mg
Correct Answer: B. 5mg
Rationale: 1000mcg = 1mg, therefore 5000mcg ÷ 1000 = 5mg .
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Question 6
A patient is prescribed 125mg of medication. The ampule contains
400mg/4mL. How many mL will you administer?