Paediatric Drug Calc

Question 1

What is the formula for estimating paediatric weight based on age?

Answer 1

Under 5 yrs = 5 kg
1-10 yrs = (Age + 4)x2
11-14 yrs = Agex3

Question 2

What is the estimated weight of a 9 year old?

Answer 2

(9+4)x2 = 26kg

Question 3

What is the estimated weight of a 12 year old?

Answer 3

12x3 = 36kg

Question 4

What is the estimated weight of a 6 year old?

Answer 4

(6+4)x2 = 20kg

Question 5

A 3 year old child requires Paracetamol because of febrile discomfort, weight is unknown, what dose should be used?

Answer 5

200mg paracetamol liquid PO based on estimated weight of 14kg (round down to 10kg)

Question 6

A 13 year old child requires Ondansetron for nausea and vomiting, what dose should be used?

Answer 6

8mg ondansetron based on estimated weight of 39kg rounded to 40kg

Question 7

A large 12 year old child weighs 50kg, what dose of Ibuprofen should be given?

Answer 7

400mg (adult dose for any child over 45kg acc to CPG’s)

Question 8

A five year old child weighing 27kg requires adrenaline, what dosage should be given?

Answer 8

0.3mg Adrenaline (go off weight not off age if you have a known weight)

Question 9

A nine year old child weighing 22kg requires loratidine what dosage should be given?

Answer 9

5mg (0.5 tablet) based on 20kg weight

Question 10

A 14 year old child requires paracetamol, weight unknown, what dosage should be given?

Answer 10

800mg syrup or 750mg tablet PO (1.5 tablets) based on rounded 40kg weight