3 terms

Clark's Rule & Young's Rule

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Young's Rule
Young's Rule
Youngs Rule uses age.
(which makes it easier to remember, the word young refers to age)

Here is the formula:

Adult Dose X (Age ÷ (Age+12)) = Child's Dose

Example
11 year old girl / 70 Lbs

500mg X (11 ÷ (11+12)) = Child's Dose

500mg X (11 ÷ 23) = Child's Dose

500mg X .48 = Child's Dose

Child's Dose = 240mg
Clark's Rule
Clark's Rule
Clark's Rule uses Weight in Lbs, NEVER in Kg.

Here is the formula:

Adult Dose X (Weight ÷ 150) = Childs Dose

Example
11 year old girl / 70 Lbs

500mg X (70 ÷ 150) = Child's Dose

500mg X ( .47 )= Child's Dose

500mg X .47 = 235mg

Child's Dose = 235Mg
Dosage based on weight
Often drugs are prescribed based on an adults or childs weight in order to more accurately dose. The calculation is very simple and easy to perform. However, you must pay close attention to whether the dosage has been prescribed per Kg or Lbs.

Example:
132 Lb woman is prescribed Acyclovir 5mg/kg

First convert Lbs. to Kg

(132 ÷ 2.2) = 60kg

The prescription calls for 5mg per kg

60 x 5mg = 300mg
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