A nurse is preparing to administer ceftriaxone 400 mg IM to an infant in two divided doses. Available is ceftriaxone injection 500 mg/2 mL. How many total mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.6"]
Step 1: Determine the total dose of ceftriaxone to administer.
The total dose prescribed is 400 mg. This dose will be divided into two equal doses for the infant.
Step 2: Calculate the volume for each dose.
The available ceftriaxone solution has a concentration of 500 mg in 2 mL. This means that 500 mg is present in 2 mL, so each mL contains 250 mg of ceftriaxone.
To calculate how many mL are needed for the total dose of 400 mg, we use the following formula:
Volume (mL)=Dose in mg/Concentration in mg/mL=400 mg/250 mg/mL=1.6 mL
Step 3: Round the answer.
1.6 mL
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Related Questions
Correct Answer is ["0.5"]
Explanation
Convert the child's weight from pounds to kilograms:
55 lb÷2.2=25 kg.
Calculate the total daily dose in mg:
0.3 mg/kg/day×25 kg=7.5 mg/day.
Determine the dose per administration:
The medication is to be given every 8 hours, which equals 3 doses per day.
7.5 mg/day÷3=2.5 mg/dose.
Calculate the number of tablets per dose:
Each tablet contains 5 mg.
2.5 mg÷5 mg/tablet=0.5 tablets.
Round to the nearest tenth:
0.5 tablets
Correct Answer is ["3.5"]
Explanation
Convert the child’s weight from pounds to kilograms:
52 lb÷2.2=23.6 kg.
Calculate the total daily dose in micrograms (mcg):
7.5 mcg/kg/day×23.6 kg=177 mcg/day.
Determine the volume in mL to administer:
The elixir concentration is 50 mcg/mL
177 mcg÷50 mcg/mL=3.54 mL.
Round to the nearest tenth:
3.54 rounds to 3.5 mL.
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