pharm calculations

Question

The usual pediatric dose of acyclovir is 20 mg/kg administered by infusion and repeated every 8 hours. What would be the single dose, in milligrams, for a child weighing 30 lb? Round your answer to the nearest whole number; do not include any units, words, or symbols with your answer.

Answer 1

Don't be fooled by the addition of the "every 8 hours." In this case you are looking for a "single dose" therefore the 8 hours is a distractor

Answer 2

Use dimensional analysis:

30 lb x 2.2 kg / lb x 20 mg / kg = 1320