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A nurse is preparing to administer phenytoin 75 mg PO. Available is phenytoin suspension 25 mg/5 mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
Answer and Explanation

The Correct Answer is ["15"]

Step 1: Determine how many milligrams are in each milliliter of the suspension.

  • Total milligrams ÷ Total milliliters
  • 25 mg ÷ 5 mL = 5 mg/mL

Step 2: Determine how many milliliters are needed to administer 75 mg.

  • Desired milligrams ÷ Milligrams per milliliter
  • 75 mg ÷ 5 mg/mL = 15 mL


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Related Questions

Correct Answer is D

Explanation

Choice A rationale:

Switching brands of phenytoin can lead to variations in drug absorption and serum drug levels, potentially leading to a loss of seizure control or toxicity. Therefore, this is not a correct instruction.

Choice B rationale:

Altering the phenytoin administration regimen each week can lead to fluctuations in serum drug levels, potentially leading to a loss of seizure control or toxicity. Therefore, this is not a correct instruction.

Choice C rationale:

Phenytoin does not turn urine blue. This is a side effect associated with some other medications, but not phenytoin. Therefore, this is not a correct instruction.

Choice D rationale:

Alcohol can increase serum phenytoin levels, potentially leading to toxicity. Therefore, this is a correct instruction.

So, the correct answer is D. Alcohol increases the chance of phenytoin toxicity.

Correct Answer is ["10"]

Explanation

Step 1 is to calculate the number of tablets needed to administer 225 mg of desipramine. This is done by dividing the prescribed dose (225 mg) by the strength of each tablet (75 mg). So, 225 mg ÷ 75 mg/tablet = 3 tablets.

So, the correct answer is 3 tablets.

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