Final answer:
When administering epinephrine via an auto-injector, the injector should be held in place for 3 seconds to ensure the proper dose is administered to treat a severe allergic reaction.
Step-by-step explanation:
When administering epinephrine via an auto-injector, you should hold the injector in place for 3 seconds. This standard recommendation ensures that a proper dose of the medication is delivered to the patient who may be experiencing a severe allergic reaction, such as anaphylaxis. Epinephrine works quickly to raise blood pressure, relax bronchial muscles, and reduce swelling, providing critical time to seek further medical attention.