Medicine Dosages

[Admin]

#13896

Fried’s Formula

Dosage for children 1 to 2 years = $$\frac{{age(months) \times adult\;dosage}}{{150}}$$

Young’s Formula

Dosage for children 1 to 12 years = $$\frac{{age(years) \times adult\;dosage}}{{age(years)+12}}$$

Clarke’s Formula

Dosage = $$\frac{{child’s\;weight\;(kg) \times adult\;dosage}}{{70}}$$

[Admin]

#18928

How much of the medicine should be given to an 18 month old child if the adult dosage is 45 mL? Use Young’s Rule to make your calculations.

Dosage for children 1 to 12 years = $$\frac{{age(years) \times adult\;dosage}}{{age(years)+12}}$$

18 ÷ 12 = 1.5 years (change months to years to use in the formula)

$$ = \frac{{1.5 \times 45}}{{1.5 + 12}}$$

= 5 mL

[Admin]

#18930

A child who weighs 14 kg needs to be given 15 mg of paracetamol for every 2 kg of body weight. Every 10 mL of a particular medicine contains 120 mg of paracetamol. What is the correct dosage in mL of this medicine for the child?
14 ÷ 2 = 7	find how many lots of 2 kg by dividing 14kg by 2
7 × 15 mg = 105 mg	we need 7 lots of 15 mg
105 ÷ 120 = 0.875	each 120mg is 10ml, so we need to find how many lots of 10ml we need by dividing 105 by 120
dosage = 0.875 × 10 = 8.75 ml	we need 0.875 lots of 10 ml

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