Review Question - QID 212490

A 2-year-old boy presents to the emergency department with a fever and a change in his behavior. His parents state his fever has persisted for the past week and has not been improving. The child was born at 39 weeks gestation, is up to date on his vaccinations, and has no medical diagnoses. His temperature is 103°F (39.4°C), blood pressure is 77/58 mmHg, pulse is 150/min, respirations are 27/min, and oxygen saturation is 98% on room air. Physical exam is notable for the findings in Figure A. Lymphadenopathy is noted on HEENT exam. Dermatologic exam reveals a desquamating rash on the palms and soles. During the patient’s visit in the emergency department, he has 1 episode of a generalized tonic-clonic seizure, which self-resolved in 30 seconds. Which of the following is the best treatment for this patient?