A 28-year-old woman presents to the emergency department with acute onset of angioedema of the lips and tongue, urticaria, and stridor 15 minutes after receiving intravenous penicillin for a urinary tract infection. She has no prior history of drug allergy. Vital signs: BP 95/60 mmHg, HR 120/min, RR 28/min. What is the most appropriate immediate next step in management?

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