NCLEX-RN PRACTICE QUESTION
A patient taking Dilantin (phenytoin) for a seizure disorder is experiencing breakthrough seizures. A blood sample is taken to determine the serum drug level. Which of the following would indicate a sub-therapeutic level?
A. 15 mcg/mL.
B. 4 mcg/mL.
C. 10 mcg/dL.
D. 5 mcg/dL.
RATIONALE
A level of 4 mcg/mL is subtherapeutic and may be caused by patient non-compliance or increased metabolism of the drug.
A level of 15 mcg/mL is therapeutic.
Choices C and D are expressed in mcg/dL, which is the incorrect unit of measurement.
The therapeutic serum level for Dilantin is 10 – 20 mcg/mL
ANSWER: B
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