Pharmacology and the Nursing Process Test Bank Free Related

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The client is taking phenyton (Dilantin) for seizure control. A sample is drawn to determine the serum drug level, and the nurse reviews the results. Which of the following would indicate a therapeutic serum drug range?

  • A. 5 to 10 mcg/ml.
  • B. 20 to 30 mcg/ml.
  • C. 10 to 20 mcg/ml.
  • D. 30 to 40 mcg/ml.
Correct Answer: A

Rationale: The correct answer is A (5 to 10 mcg/ml) because this range is typically considered therapeutic for phenytoin (Dilantin) for seizure control. Levels below 5 mcg/ml may be subtherapeutic, leading to inadequate seizure control. Levels above 10 mcg/ml can increase the risk of toxicity. Choices B, C, and D are incorrect because they are outside the optimal therapeutic range, leading to either ineffective treatment (B, C) or an increased risk of adverse effects (D). Monitoring drug levels helps ensure the medication's effectiveness while minimizing side effects.