In case of suspected allergic reaction during antibiotic administration, what is the nurse's priority action?

When a nurse suspects an allergic reaction during antibiotic administration, the most critical priority action is to stop the administration of the antibiotic. This immediate action helps prevent further exposure to the allergen, which could lead to a more severe reaction. By halting the medication, the nurse initiates a protocol to ensure the patient's safety and minimizes the risk of exacerbation.

Stopping the antibiotic allows for a rapid assessment of the patient's condition and enables the healthcare team to respond appropriately to the allergic reaction. Following this, the nurse can proceed with other necessary interventions, such as notifying the healthcare provider and administering any ordered medications like antihistamines or monitoring vital signs, but the initial step should always be to discontinue the causative agent.