Ten Minutes Following Administration of an Antibiotic,the Nurse Assesses a Patient

Ten minutes following administration of an antibiotic,the nurse assesses a patient to have edematous lips,hoarseness,and expiratory stridor.Vital signs assessed by the nurse include blood pressure 70/40 mm Hg,heart rate 130 beats/min,and respirations 36 breaths/min.What is the priority intervention?

A) Diphenhydramine ( Benadryl ) 50 mg intravenously
B) Epinephrine 3 to 5 mL of a 1:10,000 solution intravenously
C) Methylprednisolone ( Solu-Medrol ) 125 mg intravenously
D) Ranitidine ( Zantac ) 50 mg intravenously