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 ["0.8"]
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
1.6 /2 divided doses = 0.8mL
Answer: 0.8mL
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Related Questions
Correct Answer is ["0.24"]
Explanation
Step 1: Convert the infant's weight from pounds to kilograms.
To convert pounds to kilograms, we use the conversion factor 1 kg = 2.2 lb.
Weight in kg= 21/2.2≈9.55 kg
Step 2: Calculate the total daily dose of clindamycin in mg.
Total dose in mg/day=15 mg/kg/day×9.55 kg=143.25 mg/day
Step 3: Divide the total daily dose into 4 equal doses (every 6 hours).
We divide the total daily dose by 4:
Dose per administration=143.25 mg/4=35.8125 mg/dose
Step 4: Determine the volume to administer per dose.
The available clindamycin phosphate injection concentration is 150 mg/mL. To determine how many mL the nurse should administer per dose, we use the following formula:
Volume (mL)=Dose in mg/Concentration in mg/mL=35.8125 mg/150 mg/mL=0.238 mL
Step 5: Round the answer.
Rounding off 0.238 mL gives 0.24 mL.
Correct Answer is ["850"]
Explanation
Step by step calculation:
The desired dose of magnesium hydroxide is 0.85 g.
We need to convert grams to milligrams.
Converting grams to milligrams:
1 g = 1000 mg
0.85 g x 1000 mg/g = 850 mg
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