Chloe is 5 years old and was prescribed with a drug of dosage 5 mcg per kilogram body weight. The body weight of the child is 18 kilograms.
The drug dosage will be –
5 mcg prescribed for 1 kilogram body weight
Therefore, as the body weight is 18 kilograms, the child can receive maximum of 5 mcg x 18 kilograms = 90 mcg of the prescribed drug.
3d) Drug dosage as per body surface area:
Patient 1 weighs 75kg and is 1.6 metres tall. The drug dosage prescribed is 10mg/day.
As per the Mosteller formula, Body Surface Area (BSA) m2 (Mosteller, 1987)
= √ height (cm) x weight (kg) / 3600
Weight: 75kg; Height: 1.6 metres or 160cms
√ 75kg x 160cms / 3600 = √ 12000/ 3600 = √120/ 36 = 1.825 m2
If the dosage of drug is 10mg/ m2/day, then the dosage will be
1.825 m2 x 10 mg = 18.25 mg /day
