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A nurse is preparing to administer cefazolin 500 mg IM every 8 hr. Available is cefazolin 1 g vial. The package insert instructs adding sterile water 2.5 mL to yield cefazolin 330 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.)
Answer and Explanation

The Correct Answer is ["1.5"]

First, we need to calculate the amount of cefazolin 500 mg in milligrams per milliliter (mg/mL) using the information provided:

Cefazolin concentration after reconstitution = 330 mg/mL Amount of cefazolin needed per dose = 500 mg

Now we can calculate the volume (mL) required for the dose:

Volume (mL) = Amount of cefazolin needed per dose / Cefazolin concentration after reconstitution

Volume (mL) = 500 mg / 330 mg/mL ≈ 1.52 mL

Rounded to the nearest tenth, the nurse should administer approximately 1.5 mL of cefazolin per dose.


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Related Questions

Correct Answer is ["0.9"]

Explanation

  • Convert the client’s weight from pounds to kilograms:

    • 1 kilogram (kg) = 2.2 pounds (lb)
    • Weight in kg = 187 lb / 2.2 = 85 kg

  • Calculate the dose of fentanyl in micrograms (mcg):

    • Dose = 0.5 mcg/kg × 85 kg = 42.5 mcg

  • Determine the volume of fentanyl to administer:

    • Available concentration is 50 mcg/ml
    • Volume (ml) = Dose (mcg) / Concentration (mcg/ml)
    • Volume (ml) = 42.5 mcg / 50 mcg/ml = 0.85 ml

  • Round the answer to the nearest tenth:

    • Rounded volume = 0.9 ml

Correct Answer is C

Explanation

a. Docusate sodium 200 mg PO at bedtime
● This prescription is appropriate for a stool softener (Docusate sodium) commonly used to prevent or treat constipation. It's a standard dosage and administration for this type of medication and doesn't require further clarification.

b. Meloxicam 15 mg PO daily
● Meloxicam is a nonsteroidal anti-inflammatory drug (NSAID) used for pain and inflammation. This prescription indicates a standard dosage and administration for this medication and doesn't require further clarification.

c. Regular insulin 8 units subcutaneous before mealsRegular insulin 8 units subcutaneous before meals is a vague and potentially dangerous prescription. The dose of insulin should be individualized based on the client's blood glucose level, carbohydrate intake, and activity level.A prescription for "before meals" without a sliding scale or specific blood glucose parameters is incomplete and potentially dangerous The nurse should contact the provider for clarification on how to adjust the dose according to the client's needs.

d. Fentanyl 25 mcg/hr transdermal patch
● Fentanyl patches are commonly used for chronic pain management. A dose of 25 mcg/hr is within the standard dosing range for patients who are opioid-tolerant. No clarification is typically needed for this prescription.

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