34yrs old woman comes to the emergency department with a rash and pruritus. She had a sore throat for several days and took some prescription medication (amoxicillin) left over from 1 year ago. The itchy rash developed about 20-30 minutes after she took the first pill 4 hrs ago. She has no dyspnea, dizziness, nausea, diarrhea or abdominal cramps. She has no prior history of skin rash or allergies. Her temperature is 36.7 C , blood pressure is 124/82 mm Hg. And pulse is 80/min . Oxygen saturation is 98% on room air. Physical examination show multiple urticaria and mild excoriations over the upper and lower extremities and upper body. The tonsils are mildly erythematous but without exudates or swelling. Yhere is no lymph node enlargement. Lungs are clear on auscultation without wheezes. There is no stridor. Abdominal examination is unremarkable. Which og the following is the best nexct step in management of this patient?
Administer intravenous glucocorticiods.
Administer IM epinephrine.
Recommend asprin with the nexct dose of amoxicillin.
Sent for IgM antibodies against Epstien barr virus.
Treat with antihistamine.