A patient who has been taking phenobarbital for epilepsy begins taking valproic acid (Depakote) as adjunct therapy. You note in this patient that he is very drowsy. What will you do?

Request an order for liver function tests to monitor for hepatotoxicity

Notify the prescriber of the need to increase the dose of valproic acid

Notify the prescriber, and request and order to reduce the dose of phenobarbital

Explain to the patient that tolerance to sedation eventually will develop