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A nurse is preparing to administer phenobarbital 2 mg/kg/day IV divided in 2 equal doses to a client who weighs 165 lb. Available is phenobarbital 65 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 ["1.2"]

To calculate the mL of phenobarbital to administer per dose, you can use the following steps:

    Convert the client's weight from pounds to kilograms. There are approximately 2.2 pounds in 1 kilogram.
Weight in kg = 165 lb / 2.2 lb/kg ≈ 75 kg
    
    Calculate the total daily dose based on the client's weight and the prescribed dose per kilogram:
Total daily dose = 2 mg/kg/day × 75 kg ≈ 150 mg/day
    
    Since the dose is divided into two equal doses per day, calculate the dose per dose:
Dose per dose = Total daily dose / 2 = 150 mg / 2 = 75 mg
    
    Now, you need to find out how many mL of phenobarbital 65 mg/mL corresponds to a dose of 75 mg:
Volume (mL) = Dose (mg) / Concentration (mg/mL) = 75 mg / 65 mg/mL ≈ 1.1538 mL
    
Rounded to the nearest tenth, the nurse should administer approximately 1.2 mL of phenobarbital per dose.
 


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Related Questions

Correct Answer is ["0.5"]

Explanation

To calculate how many tablets of lisinopril 5 mg the nurse should administer to achieve a 2.5 mg dose, divide the desired dose by the dose per tablet:

Number of tablets = Desired dose / Dose per tablet

Number of tablets = 2.5 mg / 5 mg/tablet

Number of tablets = 0.5 tablets

Correct Answer is ["0.71"]

Explanation

To calculate how many milliliters (mL) of the reconstituted medication to administer, you need to determine the desired dose and then divide it by the concentration of the reconstituted solution.

The label indicates that each vial, when reconstituted, contains ceftriaxone 350 mg/mL.

The desired dose is 250 mg.

So, you can use the following formula:

Volume to administer (mL) = Desired dose (mg) / Concentration of the reconstituted solution (mg/mL)

Volume to administer (mL) = 250 mg / 350 mg/mL

Volume to administer (mL) = 0.7143 mL (rounded to the nearest hundredth)

Therefore, the nurse should administer approximately 0.71 mL of the reconstituted ceftriaxone solution.

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