Metric Conversions, Giving The Correct Amount For Injection, Calculating Infusion Times, Solution Strength Worksheet With Answers Page 7
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22LDU Maths, Stats and Numeracy Support
Body Weight Calculations (single dose)
To work out the dosage based on the weight of the patient use the following formula
Dosage required = prescription x body weight
Example:
Mrs B has been prescribed Ibuprofen 5mg/kg/dose. She weighs 60 kg. Calculate how
much Ibuprofen you will give her.
Answer:
5 mg x 60 = 300 mg
Note, the answer is never in kg (this only refers to the body weight)
Try the following questions
1) A patient has been prescribed Erythromycin, 40 mg/kg/dose. He weighs 74 kg.
What is the dosage in mg?
2) A male patient weighs 90 kg and has been prescribed, 1.5 mg/kg/dose of drug
X. How many mg will he need for a single dose?
3) Cloxacillin, 50 mg/kg/dose has been prescribed to a patient, whose weight is
45 kg.
a) How many mg are required for a single dose?
b) How many grams is this?
4) A female patient has been prescribed Chloramphenicol, 40 mg/kg/dose. She
weighs 78 kg. How many grams of the drug does she require for each dose?
5) A patient weighs 60kg and requires 40 mcg/ kg of a drug.
a) How many mcg are required?
b) How many mg is this?
6) A patient who is 5 years old and weighs 20 kg has been prescribed 5 mcg per
kilogram body weight of Digoxin elixir. The Digoxin elixir is available as 50 mcg
per ml.
a) How many mcg does the patient require per single dose?
b) What volume will you give the patient at each dose?
numeracy@mdx.ac.uk
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