How to prescribe or confirm the child’s dose using adult dose




Sometimes you are skeptical about the drugs you are buying from your chemists. May be you have been wondering how you can confirm whether these drugs are in their correct doses or not. Truly, some of chemists use trial methods to prescribe drugs for their customers. This conduct always results in medical challenges. However, do you know you can determine the correct dose of the drug for your child, even if you are not a medical expert? Yes, you can. Though, you have to do some calculations to get the right dose for your child using the adult dose.

By using the Cowling’ Rule it is possible to get the correct dose for your child using the adult dose. The Cowling’s Rule is a method which converts the adult dose into the child’s dose using the age of the child. The Cowling’s Rule formula consists of three variables (d, a and D). The equation for the Cowling’s rule is represented by:

d=D (a+1)/24

d denotes the child’s dose. D represents the adult dose while a signifies the child’s age. When you know two of the variables, you can determine the unknown variable. Let assume you know the age of your child, and the adult dose of the same drug, you can calculate the dose of the child. Additionally, if you know the adult dose and the child's dose you can determine the child's age. You can also apply this formula to get the dose of the adult.


Examples
(1) A two year child requires a particular dose of ibuprofen. Calculate the child’s dose when the adult dose is 200mg. To solve this problem, one needs to appropriately substitute the known variables into the Cowling's Rule formula as follows:
a=2 years
D=200mg ibuprofen
d (child’s dose)=?
d=200mg (2+1)/24
=25mg ibuprofen

(2) Calculate the age of the child if the child’s dose and adult dose are 300mg and 750mg ibuprofen respectively. Treat this problem as in the first example.
d=300mg ibuprofen
D=750mg ibuprofen
a (child’s age)=?
300mg ibuprofen=750mg ibuprofen (a+1)/24
300mg X 24=750mga + 750mg
7200mg=mg (750a + 750)
7200=750a + 750
7200-750=750a
6450=750a
a=6450/750= 8.6 years

The Cowling’s Rule is an excellent principle which can help you confirm whether the prescribed drug for your child is of correct dose or not. Though, you have to correctly substitute three variables into the Cowling’s Rule formula.


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