Final answer:
After administering an EpiPen for an allergic reaction, the individual must seek immediate medical attention. The effect of the EpiPen is temporary and a secondary phase of the reaction can occur, necessitating further medical treatment such as antihistamines and corticosteroids.
Step-by-step explanation:
After administering an EpiPen for an allergic reaction, the next step is to seek immediate medical attention. An EpiPen contains epinephrine, which is essential for counteracting the symptoms of anaphylaxis, a severe allergic reaction that can be life-threatening. The epinephrine works quickly to improve breathing, stimulate the heart, reverse hives, and reduce swelling of the face, lips, and throat. However, the effect of the EpiPen is temporary, and there may be a secondary phase to the allergic reaction that requires further medical treatment. It is crucial to call emergency services or go straight to the nearest emergency room even if symptoms appear to be improving. Follow-up treatment may include giving the patient antihistamines and slow-acting corticosteroids to prevent potential late-phase reactions.