A LITTLE LIGHTBULB MOMENT
Pharmaceutical calculations and dimensional analysis · Applied dosing calculations
Divide the day before drawing the dose
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A daily pizza gets sliced into doses.
The idea behind the cue
Distinguish mg/kg/day from mg/kg/dose before converting a dose to liquid volume.
Practice this flashcard →Make it memorable
Short & simple
A daily pizza gets sliced into doses.
Acronym
A daily pizza gets sliced into doses.
Story
A daily pizza gets sliced into doses.
Connect the pieces
- 30 mg/kg/day × 24 kg = 720 mg/day; divide by 3 = 240 mg/dose. Then 240 mg × 5 mL/120 mg = 10 mL/dose.
Know the limits
Original educational exercise. Use only the stated assumptions; a calculated quantity is not a prescribing recommendation. Real dosing requires drug-, indication- and patient-specific guidance.
Open RN · Nursing Skills, Math Calculations ↗Check your understanding
For this calculation exercise, an order specifies 30 mg/kg/day in three equal doses for a 24-kg child. The supplied liquid is 120 mg/5 mL. How many mL are required per dose? Enter the number only.
Reveal explanation
10 mL (tolerance ±0.001)
30 mg/kg/day × 24 kg = 720 mg/day; divide by 3 = 240 mg/dose. Then 240 mg × 5 mL/120 mg = 10 mL/dose.
Open RN · Nursing Skills, Math Calculations ↗