In case of a severe allergic reaction, what is the first action you should take?

In the event of a severe allergic reaction, commonly recognized as anaphylaxis, the most critical first action is to administer an epinephrine auto-injector if available. This is because epinephrine is the first-line treatment that can quickly reverse the life-threatening symptoms associated with anaphylaxis. By constricting blood vessels, it increases blood pressure, and it also helps to open airways in the lungs, improving breathing while alleviating swelling and hives on the skin.

While calling emergency services and checking for a pulse are important steps that follow the initial administration of epinephrine, they do not address the immediate physiological threats posed by anaphylaxis. Laying the person flat might be appropriate in certain situations; however, it could be counterproductive as it may impede breathing in an individual experiencing severe respiratory distress due to an allergic reaction. Therefore, the immediate use of an epinephrine auto-injector is paramount and is the correct first action to take in such scenarios.