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When Ibuprofen is given for fever to children 6 months of age up to 2 years, the usual dose
is 5 milligrams (mg) per kilogram (kg) of body weight when the fever is under 102.5 degrees Fahrenheit.
How much medicine would be usual dose for a 18 month old weighing 27 pounds
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The dosage should be 5 mg per kilogram of body weight.
27 lbs. = 27*0.453592 = 12.25 kilograms (rounded).
Regarding the age and the body temperature, we are in the right diapason.
So, we can apply the given formula
the medicine amount = 12.25 x 5 mg = 61.25 mg Ibuprofen for 27 lbs. body weight.
ANSWER : 61.25 mg Ibuprofen for 27 lbs. body weight.
Solved.
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I am not a medical doctor.
If you really are going to apply this medicine, talk with a doctor.