What action should a nurse take if a patient exhibits signs of an allergic reaction?

When a patient exhibits signs of an allergic reaction, administering prescribed antihistamines, if ordered, is crucial because antihistamines can effectively counteract the effects of histamine release, which is a key component of allergic reactions. These medications help alleviate symptoms such as itching, hives, and swelling, and they can prevent the escalation of the reaction into more severe symptoms.

Antihistamines act by blocking histamine receptors, which reduces the inflammation and discomfort associated with allergic responses. Prompt administration can be vital, especially if the allergic reaction is starting to escalate, as it can mitigate the potential for more serious complications, such as anaphylaxis.

Monitoring the patient is essential, but simply observing without taking action, as suggested by ignoring the signs or maintaining fluid intake only, could place the patient at risk for worsening symptoms. Antihistamines are a proactive intervention, and their timely use is a standard nursing practice in managing allergic reactions.