What is the priority nursing action when a client exhibits signs of anaphylaxis?

The priority nursing action when a client exhibits signs of anaphylaxis is to administer epinephrine. Anaphylaxis is a severe and potentially life-threatening allergic reaction that requires immediate action to prevent fatal outcomes. Epinephrine works quickly to counteract the symptoms of anaphylaxis by constricting blood vessels, which helps to increase blood pressure, reducing swelling and hives, and opening the airways, making breathing easier.

While monitoring vital signs, administering oxygen, and calling for assistance are also important components of managing anaphylaxis, they are not the first priority. Epinephrine should be administered as soon as anaphylaxis is suspected because it directly addresses the dangerous physiological changes occurring in the body. Delaying epinephrine administration for other actions could result in serious complications or even death, highlighting the critical nature of this intervention in life-threatening situations.