A 2-year-old boy is brought to the emergency department by amb | Neurology collections 2020

A 2-year-old boy is brought to the emergency department by ambulance due to convulsions. This morning, the patient was sitting on the sofa at home when he suddenly developed rhythmic movements of both arms and legs that lasted about 3 minutes. He was not responsive during the event. Emergency personnel report that the child was sleepy and seemed confused when they arrived. The patient has had rhinorrhea for the past 2 days and fever since this morning. He has had no cough, vomiting, or diarrhea. The patient has no chronic medical conditions, and immunizations are current. His uncle has epilepsy. Temperature is 39.2 C (102.6 F). Physical examination shows an alert and playful toddler. Bilateral conjunctivae are clear, and clear rhinorrhea is present. The neck is supple with full range of motion. Mucous membranes are moist, and capillary refill is <2 seconds. The remainder of the examination is normal. After treating the fever with acetaminophen, which of the following is the best next step in management of this patient?