A client tells their provider they have had difficulty sleeping for six months. They are requesting a sleep aid to take as needed. Which medication would the nurse anticipate the provider to order?

The therapeutic range for valproic acid is 50-100 mcg/mL ¹. In this case, the client has a serum range for valproic acid of 130 mcg/mL, which is above the therapeutic range but below the toxic level of >100 mcg/mL ¹. The nurse would anticipate that the provider will increase the daily dose of valproic acid to bring the serum range within the therapeutic range.
Option A is incorrect because the serum range is above the therapeutic range and changes may be needed.
Option C is incorrect because changing the medication may not be necessary if adjusting the dose can bring the serum range within the therapeutic range.
Option D is incorrect because decreasing the dose would lower the serum range further below the therapeutic range.

The half-life of a medication is the time it takes for the concentration of the medication in the body to decrease by half. In this case, the medication has a half-life of 2 hours and a current toxic level of 40 mEq/dL. After 2 hours, the level will decrease to 20 mEq/dL. After another 2 hours (4 hours total), the level will decrease to 10 mEq/dL, which is within the normal range. However, it will take another 21 half-lives (42 hours) for the level to reach 5 mEq/dL, which is the lower end of the normal range. Therefore, it will take a total of 25 hours (4 + 21) for the medication to reach the normal range.
Option B is incorrect because it would take much longer than 24 hours for the medication to reach the normal range.
Option C is incorrect because it would only take 2 hours for the medication to decrease by half, not reach the normal range.
Option D is incorrect because it would take longer than 4 hours for the medication to reach the normal range.