Timmy is a 7-year-old child who weighs 52 lb. His mother brought him to the walk-in clinic because he has a persistent earache that was not relieved by over-the-counter medications. The physician diagnoses a moderate ear infection and prescribes Erythromycin suspension 275 mg po q12h for 7 days. On hand is erythromycin oral suspension 
. The package insert indicates that the usual dosage for children over 3 months of age is either 25 mg/kg/day in divided doses every 12 h, or 20 mg/kg/day in divided doses every 8 h. Determine if the dose is safe. If it is safe, calculate the amount to administer: ________. If the dose is not safe, write: not safe. (Round to
nearest whole number)
Fill in the blank(s) with the appropriate word(s).
6.9 mL
Convert the weight to kg:
52 lb ×
= 23.6 kg
Determine whether the dose is safe:
275 mg q12h = 2 × 275 mg = 550 mg per day.
The maximum safe dose every 12 hours is 25 mg/kg/day.
23.6 kg × 25 mg/kg = 590 mg per day, so a dose of 550 mg per day is safe.
Calculate the amount to administer:
H = 100 mg; Q = 2.5 mL; D = 275 mg
A = 
× 2.5 mL = 6.875 mL, rounded to 6.9 mL
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