Pediatric Dosage Calculations
Technical Math
Pediatric Dosage
1) Calculate the single dose for a child weighing 18 kg. The C.P.S. states that Theophylline
can be administered 5 mg/kg q.8h.
2) The C.P.S. states that a child’s does of Acetaminophen(Tylenol) elixir is 10 mg/kg q6h.
The child weighs 8 kg. Calculate a safe single dose.
3) The C.P.S states that Phenytoin( Dilantin) can be administered 5 mg/kg/day. The child
weights 15 kg. What would be a safe daily dose of Phenytoin?
4) Mary is 11 years old and weighs 34.5kg. The doctor has ordered Erythromycin 345 mg
po q6h for respiratory infection. The C.P.S states that the recommended dose is 20-50
mg/kg/day in 4 divided doses.
(a) Calculate the minimum and maximum total daily dose for Mary.
(b) Is Mary’s dose of Erythromycin 345 mg po q6h within the recommended range?
5) Tylenol elixir is ordered po q4h prn for pain. The recommended dose for a child < 10
years old is 10 -15 mg /kg/dose not to exceed 65 mg/kg/day and for an adult or a child
> 10 years old is 325-650 mg q4h prn, not to exceed 4g/day.
(a) What is the safe single minimum and maximum dose for Mary, age 7 years and
weighing 22.5 kg?
(b) James, age 3 years weighs 12.6 kg and is ordered Tylenol 100 mg. Is this dose
acceptable?
(c) Julie age 11, is ordered 480 mg of Tylenol po q4h. She weights 34.5 kg. Is this
dose within the recommended range?
6) What would be the recommended single dose of Amoxicillin for a child weighing 16 kg?
Usual pediatric dose is 40 mg/kg/day in 4 divided doses.
7) The suggested dosage of tobramycin (Nebcin) is 4 mg/kg/day for a neonate who weighs
3 kg. If the dosage must be divided and given every 12 hours, how many milligrams will
the child receive in each dose?
8) A doctor prescribes 7.5 mg/kg of amikacin(Amikin) every 12 hours for a 4 kg infant. How
many milligrams of the drug will be the infant receive each day?
9) If the suggested dosage of chloramohenicol(Chloromycetin) is 50 mg/kg/day in divided
doses every 6 hours, how many milligrams should the nurse give at each dose to a 17 kg
child?
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