How much of the medicine should be given to an 18 month old child if the adult dosage is 45mL? 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)
$$ = \frac{{1.5 \times 45}}{{1.5 + 12}}$$