Clark's rule

Clark's Rule[edit | edit source]

Clark's rule is a method used in pharmacology to calculate the appropriate dosage of a medication for a child based on their weight. This rule is particularly important in pediatric medicine to ensure that children receive the correct amount of medication for their size.

Calculation Formula[edit | edit source]

According to Clark's rule, the dosage for a child is calculated by dividing the adult dosage by the child's weight in pounds, and then multiplying by 150. The formula can be expressed as:

\[ \text{Child's Dosage} = \frac{\text{Adult Dosage}}{\text{Weight in pounds}} \times 150 \]

This calculation helps adjust the dosage based on the child's weight, as children metabolize medications differently than adults.

Importance[edit | edit source]

Using Clark's rule is crucial in pediatric medicine to prevent under or overdosing of medications in children. Since children come in various sizes and weights, a standardized method like Clark's rule helps healthcare providers determine the appropriate dosage for each individual child.

Example[edit | edit source]

For example, if the adult dosage of a medication is 100 mg and a child weighs 50 pounds, the calculation using Clark's rule would be:

\[ \text{Child's Dosage} = \frac{100}{50} \times 150 = 3 \times 150 = 150 \text{ mg} \]

Therefore, the child's dosage would be 150 mg based on Clark's rule.

Application in Clinical Practice[edit | edit source]

Healthcare providers, particularly pediatricians and pharmacists, use Clark's rule when prescribing medications to children. By taking into account the child's weight, they can calculate a safe and effective dosage that is tailored to the child's individual needs.