What should be done immediately if a patient shows signs of an allergic reaction to IV medication?

Stopping the infusion immediately in the case of an allergic reaction to IV medication is crucial for patient safety. This action is a priority because continuing the infusion could exacerbate the reaction, potentially leading to more severe symptoms or anaphylaxis, which is life-threatening. Stopping the medication helps to prevent further exposure to the allergen and allows for a swift response to manage the reaction.

Notifying the physician is also essential, as they can assess the severity of the reaction and determine the next steps for treatment, which may include the administration of antihistamines or other interventions, such as corticosteroids or epinephrine in severe cases. This coordinated approach ensures that the patient receives timely and appropriate care.

In contrast, continuing the infusion would compromise patient safety by allowing continued exposure to the allergen. Administering antihistamines without consulting a healthcare provider may not address more severe allergic reactions adequately, and changing the medication route may not be appropriate if the patient is allergic to a component of the medication itself rather than the route of administration. Thus, the best course of action is to stop the infusion and notify the physician.