FCEM2-0267
You review a 25 year old male who presented to the emergency department after developing a raised red itchy rash to the arms, legs, and abdomen shortly after going for a hike. The patient informs you that he had eaten some trail mix and drank some water during the hike, but he had not had a reaction to these in the past. On examination, the mouth and throat are normal, the patient is speaking without difficulty, and there is no wheezing. The patient’s vital signs are as follows:
Respiratory rate: 16 bpm
Blood pressure: 120/70 mmHg
Pulse rate: 75 bpm
Oxygen saturations: 98% on room air
Temperature: 37.0ºC
You diagnose urticaria. What is the most appropriate treatment to administer?