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A 32-year-old man being treated with IV cefazolin for bacterial pneumonia develops audible stridor, a rapidly spreading urticarial rash, diaphoresis, and a blood pressure of 78/44 mmHg. He is alert and answering questions. His code status is documented as full code. The nurse recognizes this presentation as anaphylaxis. Which medication is the correct FIRST-line treatment for this reaction?
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