The patient is a 4-year-old child who weighs 33 lb 6 oz.Ordered: Erythromycin suspension 180 mg po qid for 7 daysOn hand: See labelDetermine if the dose is safe. If it is safe, calculate the amount to administer: ________. If the dose is not safe, write: not safe.
Fill in the blank(s) with the appropriate word(s).
4.5 mL
Convert weight to kg:
6 oz × 
= 0.375 lb
33.375 lb × 
= 15.2 kg
Determine if the dose is safe:
According to the label, the usual dose for children is 30-50 mg/kg/day in divided doses. The maximum daily dose for this patient would be 50 × 15.2 = 760 mg. Divide this by 4 doses per day to find the maximum dose: 
. The ordered dose is less than 190 mg, so the dose is safe.
Calculate the amount to administer:
H = 200 mg; Q = 5 mL; D = 180 mg
A = 0.9 × 5 mL
A = 4.5 mL
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