Question

scenario:
a 40-year-old patient with bipolar disorder on carbamazepine reports dizziness and double vision. the serum carbamazepine level is found to be 14 mcg/ml.

question:
what is the most appropriate action for the nurse practitioner to take?

• continue the current dose, as these side effects will subside with time.
• increase the dose to achieve better mood stabilization.
• decrease the dose or hold the medication and recheck levels due to toxicity.
• add valproate to the treatment regimen.

Explanation:

1. Recall the therapeutic and toxic range of carbamazepine: The therapeutic range for carbamazepine is typically 4 - 12 mcg/mL. A serum level of 14 mcg/mL is above this range, indicating possible toxicity.
2. Analyze each option:

• Option 1: Side effects from toxicity won't subside with time if the dose is continued; this is incorrect.
• Option 2: Increasing the dose will worsen toxicity; incorrect.
• Option 3: Since the level is toxic (14 > 12), decreasing the dose, holding the medication, and rechecking levels is appropriate to manage toxicity and symptoms (dizziness, double vision).
• Option 4: Adding another medication without addressing toxicity is inappropriate.

Answer:

C. Decrease the dose or hold the medication and recheck levels due to toxicity.