Lesson overview
Safe Dose Range & Maximum Dose Calculations
Ready when you are
Start with short teaching slides, then answer the lesson questions. Your progress stays on this browser.
Learning outcomes
What you will learn
- find the lower and upper limits of a supplied mg/kg/dose range
- compare a prescribed dose with those calculated limits
- apply a separately stated per-dose or per-day maximum on the matching basis
- recognise that MedMaths fictional hyphenated ranges include their stated boundary numbers while real references must be read exactly as written
- stop when required values are missing, conflicting or would create an inverted range
- keep frequency, minimum interval and other source instructions separate from the maximum-dose arithmetic
Clinical connection
Why this matters
A weight-based upper calculation can be limited by a separate maximum, but the maximum must be applied on the basis actually supplied — per dose is not per day. A matching daily maximum is applied to the whole-day upper boundary before any divided-dose conversion.
Quick concept
How to calculate a supplied safe dose range
Start with the dose range exactly as supplied by the practice reference. Multiply each mg/kg limit by the current weight in kilograms. If the range is written per day, keep it as a daily total until the stated schedule tells you how that total is divided. Compare the order only after the time basis matches.
Formula
lower or upper limit (mg) = supplied mg/kg limit × weight (kg)
Worked example
Educational example: a fictional reference states 8–12 mg/kg/dose for a 25 kg patient, with no separate maximum supplied.
8 × 25 = 200 mg; 12 × 25 = 300 mg
Answer: The calculated reference range is 200–300 mg per dose for the stated practice values
The arithmetic checks an order against limits already supplied by a current reference. It does not select a medicine, create a safe range, validate a prescription or replace product information, patient-specific assessment, pharmacist review or local policy.
Lesson plan
How the lesson works
- 1
Learn
Short teaching slides explain one idea at a time with plain-language examples.
- 2
Practise
Answer calculation or scenario questions and receive immediate feedback.
- 3
Finish
Complete the lesson check and save your learning progress on this browser.
Keep going
Learn, practise, apply and check this skill
Use the page that matches what you need next. Each resource has a different job, so the lesson can stay focused on teaching the skill.
Practise
Safe dose range practice questions
Practise per-dose, per-day, maximum-dose and order-comparison problems across four levels.
Understand
Safe dose ranges & maximum doses explained
Review time-basis wording, supplied limits, maximum-dose rules and calculation boundaries.
Check
Weight-Based Dose Calculator
Calculate a weight-based dose and volume when the ordered mg/kg value and current concentration are already known.
Apply
Paediatric calculation cases
Use weight-based doses, supplied limits and medication calculations inside evolving paediatric scenarios.