Final answer:
The nurse should prioritize administering phenytoin with a sip of water prior to the surgery to prevent seizures during and after surgery.
Step-by-step explanation:
The nurse should prioritize administering phenytoin with a sip of water prior to the surgery. Phenytoin is an antiepileptic medication that is commonly prescribed preoperatively to prevent seizures during and after surgery. It is important to administer phenytoin with a sip of water to enhance absorption and ensure its therapeutic effect.