The nurse prepares to administer a 1,000 mg loading dose of phenytoin IV to a client with a subarachnoid hemorrhage. Which consideration is most important when administering this dose?

Dilantin should be mixed in dextrose in water before administration.

Dilantin should be administered through an IV catheter in the client's hand.

Rapid Dilantin administration can cause cardiac dysrhythmias.

Therapeutic drug levels should be maintained between 20 to 30 mg/mL.