Question

An infant ibuprofen suspension contains 100 mg/5.0mL suspension. The recommended dose is 10 mg/kg body weight.How many milliliters of this suspension should be given to an infant weighing 15 lb ? (Assume two significant figures.)

Answer 1

Answer : 3.4 mL of this suspension should be given to an infant weighing 15 lb.

Explanation :

First we have to convert weight of infant from 'lb' to 'kg'.

Conversion used :

As, 1 lb = 0.454 kg

So, 15 lb = $\frac{15lb}{1lb}\times 0.454kg=6.81kg$

Now we have to calculate the recommended dose.

As, 1 kg weight recommended dose 10 mg

So, 6.81 kg weight recommended dose $\frac{6.81kg}{1kg}\times 10mg=68.1mg$

Now we have to calculate the milliliter of ibuprofen suspension.

As, 100 mg dose present in 5.0 mL

So, 68.1 mg dose present in $\frac{68.1mg}{100mg}\times 5.0mL=3.4mL$

Therefore, 3.4 mL of this suspension should be given to an infant weighing 15 lb.