Metric Conversions, Giving The Correct Amount For Injection, Calculating Infusion Times, Solution Strength Worksheet With Answers Page 9
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22LDU Maths, Stats and Numeracy Support
Body weight calculations (TDD and divided doses)
Sometimes the dose of a drug is written as a Total Daily Dose (TDD) usually given in 3
or 4 divided doses.
It is very important that you notice the difference between a TDD and a single dose
otherwise you could give 3 or 4 times too much!
Also you need to know that bd means twice a day, tds means 3 times a day and qds
means 4 times a day.
Sometimes medicines are given every 4 hours (6 times a day).
Example: Mrs B has been prescribed Ibuprofen 5mg/kg/day in 3 divided doses. She
weighs 60 kg.
a) Calculate her daily dose.
b) Calculate a single dose
Answer:
a) TDD = dose x body weight = 5 mg x 60 = 300 mg/day
b) Single dose =
= 100mg/single dose
Try the following questions
1) Mrs K has been prescribed Amoxicillin, 45 mg/kg/day and she weighs 50 kg.
How many mg of Amoxicillin will you give her for the whole day?
2) A patient, whose weight is 67.5 kg, has been prescribed Drug X, 10 mg/kg/day
in 3 divided doses.
a) Calculate his TDD.
b) Calculate the single dose.
3) A patient has been prescribed Capreomycin sulphate, 5 mg/kg qds. He weighs
94 kg. What is his total daily dose?
4) A patient has been prescribed Cephalothin, 20 mg/kg tds. She weighs 67 kg,
what will be her total daily dose in grams?
5) A patient has been prescribed Chloramphenicol, 45 mg/kg/day in 4 divided
doses. She weighs 70 kg.
a) What is her TDD?
b) What is the single dose?
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