A true statement about epinephrine auto-injectors (EAIs) is that EAIs deliver a single, fixed dose of epinephrine to counteract severe allergic reactions (anaphylaxis). They do not contain several adjustable doses. Calling 911 is essential after using an EAI because the effects of epinephrine are temporary and further medical care is often needed. EAIs should be carried at all times by individuals at risk for anaphylaxis, regardless of the presence of environmental allergens.
Additionally, the effect of epinephrine lasts about 10-20 minutes, and if symptoms persist or return, a second injection may be given with a new EAI while waiting for emergency medical services. The EAI also simplifies drug administration by providing a premeasured dose, avoiding the need for the user to measure or see the needle prior to injection.
