During a routine appointment, a patient with a history of seizures is found to have a phenytoin level of 23 mcg/mL. What concern will the nurse have, if any?
The drug level is at a toxic level, and the dosage needs to be reduced.
The patient's seizures should be under control if she is also taking a second antiepileptic drug.
The patient is at risk for seizures because the drug level is not at a therapeutic level.
The patient's seizures should be under control because this is a therapeutic drug level.
The Correct Answer is A
A. The drug level is at a toxic level, and the dosage needs to be reduced. Phenytoin has a narrow therapeutic range, and levels above 20 mcg/mL are considered to be in the toxic range.
Symptoms of phenytoin toxicity can include nystagmus, ataxia, slurred speech, and confusion. Therefore, if a patient's phenytoin level is 23 mcg/mL, the nurse should be concerned about potential toxicity and consult with the healthcare provider to adjust the dosage.
B. The patient's seizures should be under control if she is also taking a second antiepileptic drug.
While combination therapy with multiple antiepileptic drugs can help control seizures, a phenytoin level of 23 mcg/mL is still concerning for toxicity and requires intervention.
C. The patient is at risk for seizures because the drug level is not at a therapeutic level. A phenytoin level of 23 mcg/mL is actually above the therapeutic range and is more indicative of toxicity rather than subtherapeutic levels.
D. The patient's seizures should be under control because this is a therapeutic drug level. A phenytoin level of 23 mcg/mL is not within the therapeutic range but rather in the toxic range, so the patient may experience symptoms of toxicity rather than having adequate seizure control.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. A lithium level of 0.9 mEq/L falls within the therapeutic range for lithium, so it is not too low.
B. A lithium level of 0.9 mEq/L is within the therapeutic range for lithium maintenance therapy, which typically ranges from 0.6 to 1.2 mEq/L. Therefore, it is considered therapeutic.
C. Lithium is commonly monitored with blood levels to ensure therapeutic efficacy and to prevent toxicity.
D. A lithium level of 0.9 mEq/L is not too high; it is within the therapeutic range.
Correct Answer is C
Explanation
A. Take the medication in the morning to prevent insomnia: This instruction is not directly
related to minimizing anticholinergic effects; it's more about managing the timing of medication administration.
B. Use cooling measures to decrease fever: Anticholinergic effects do not typically cause fever, so this instruction is not relevant.
C. Chew sugarless gum to moisten the mouth: Anticholinergic medications can cause dry mouth (xerostomia), and chewing gum can stimulate saliva production, alleviating this side effect.
D. Take an antacid to relieve nausea: Anticholinergic effects can include nausea, but taking an antacid is not a specific strategy for managing this side effect.
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