A nurse is preparing to administer ceftriaxone 75 mg/kg/day IM in two divided doses to a child who weighs 37 lb. The amount available after reconstitution is ceftriaxone 350 mg/mL. How many mL should the nurse administer per dose? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["1.8 "]
Given:
- Desired dose of ceftriaxone: 75 mg/kg/day
- Child's weight: 37 lb
- Available strength of ceftriaxone after reconstitution: 350 mg/mL
First, convert the child's weight from pounds to kilograms: 37 lb ÷ 2.20462 = 16.78 kg (rounded to the nearest hundredth)
The total daily dose of ceftriaxone:
Total daily dose = Desired dose × Child's weight
Total daily dose = 75 mg/kg/day × 16.78 kg Total daily dose ≈ 1258.5 mg
Since the total daily dose is to be divided into two equal doses, each dose would be:
Each dose = Total daily dose / Number of doses per day Each dose = 1258.5 mg / 2
Each dose = 629.25 mg
The milliliters of ceftriaxone correspond to each dose:
Volume (mL) = Dose / Concentration
Volume (mL) = 629.25 mg / 350 mg/mL Volume (mL) ≈ 1.8 mL
So, the nurse should administer approximately 1.8 mL of ceftriaxone per dose.
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Related Questions
Correct Answer is ["0.63 "]
Explanation
Given:
- Desired dose of testosterone cypionate: 125 mg
- Available strength of testosterone cypionate injection: 200 mg/mL
First, find out how many milliliters of testosterone cypionate correspond to the desired dose:
Volume (mL) = Desired dose / Concentration
Volume (mL) = 125 mg / 200 mg/mL Volume (mL) = 0.625 mL
Rounded off to the nearest hundredth= 0.63ml
So, the nurse should administer approximately 0.63 mL of testosterone cypionate per dose.
Correct Answer is ["1 "]
Explanation
Given:
- Desired dose of metronidazole: 7.5 mg/kg
- Client's weight: 146.7 lb
- Available strength of metronidazole tablets: 500 mg
First, convert the client's weight from pounds to kilograms:
146.7 lb ÷ 2.20462 = 66.57 kg (rounded to the nearest hundredth)
Now, calculate the desired dose of metronidazole:
Desired dose = Dosage per kg × Weight Desired dose = 7.5 mg/kg × 66.57 kg Desired dose ≈ 498.775 mg
Next, find out how many tablets are needed to achieve this dose: Number of tablets = Desired dose / Strength per tablet
Number of tablets = 498.775 mg / 500 mg Number of tablets ≈ 0.997
Since we cannot administer a fraction of a tablet, the nurse should administer 1 tablet of metronidazole.
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