mrcem2-1434

A 5 year old girl is brought into the emergency room. Her mother witnessed her putting something in her mouth. She believes it was a small object, but the girl swallowed it and within 5 minutes her face began to swell. You determine that she is experiencing anaphylaxis and start administering the necessary first-line medications. After stabilizing her condition, you decide to administer cetirizine. What is the appropriate dosage of cetirizine for this patient?