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A nurse is caring for a client who has status epilepticus. The provider prescribes phenobarbital 400 mg IV bolus stat, then 200 mg IV bolus every 20 min until seizure activity stops, maximum 2 g. Available is phenobarbital injection 130 mg/mL. How many mL should the nurse administer per dose after the initial 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"]

To calculate the amount of phenobarbital injection needed for each dose after the initial  dose, we need to divide the prescribed dose (200 mg) by the concentration of the  injection (130 mg/mL). This gives us: 

200 mg / 130 mg/mL = 1.538 mL 

To round this to the nearest tenth, we look at the hundredths place and see that it is 3,  which is less than 5, so we round down and drop the rest of the digits. This gives us: 

1.5 mL 

Therefore, the nurse should administer 1.5 mL of phenobarbital injection per dose after  the initial dose. 


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Related Questions

Correct Answer is ["3.5"]

Explanation

  1. Convert the client's weight from pounds to kilograms:

    • 154 lb ÷ 2.2 lb/kg = 70 kg

  2. Calculate the total dose required:

    • 0.25 mg/kg × 70 kg = 17.5 mg

  3. Determine the volume to administer:

    • Given concentration: 5 mg/mL
    • 17.5 mg ÷ 5 mg/mL = 3.5 mL

  4. Rounding to the nearest tenth:

    • The answer remains 3.5 mL

So the nurse should administer 3.5 mL of diltiazem IV injection.

which is 17.5 mg / 5 mg/mL = 3.5 mL. Rounding to the nearest tenth, the nurse should administer 3.5 mL of diltiazem IV injection.

Correct Answer is ["0.3"]

Explanation

To calculate the dose of cefazolin for a neonate, first multiply the weight by the dosage per day: 5 kg x 40 mg/kg/day = 200 mg/day. Then divide by the number of doses per day: 200 mg/day / 2 doses/day = 100 mg/dose. Next, use the formula D/H x Q to find the volume to administer, where D is the dose, H is the strength of the solution, and Q is the quantity of the solution. Plug in the values: 100 mg / 330 mg/mL x 1 mL = 0.3 mL. Round to the nearest tenth: 0.3 mL. Therefore, the nurse should administer 0.3 mL of cefazolin per dose.

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