The physician orders 20 mg/kg/24 hours of a drug to be given orally to a child weighing 22 kg. How much should you give every 12 hours?
20 mg X kg = dose in 24 hours
20 mg X 22 kg = 440 mg in 24 hours
440 divided by 2 doses = 220 mg per dose
You should give 220 mg every 12 hours.