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 =
`(15lb)/(1lb)* 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
`(6.81kg)/(1kg)* 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
`(68.1mg)/(100mg)* 5.0mL=3.4mL`

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