What drug is commonly administered for severe allergic reactions?

Epinephrine is commonly administered for severe allergic reactions, particularly those related to anaphylaxis. This drug works by rapidly constricting blood vessels, which helps to increase blood pressure and reduce swelling in the throat and other areas, effectively countering the severe symptoms associated with anaphylaxis. It also relaxes the muscles in the airways, making it easier for the person to breathe.

Epinephrine’s quick action and effectiveness in reversing life-threatening allergic reactions make it the first-line treatment in emergency situations. Understanding its role is crucial for a combat medic, as timely administration can save a patient's life during a severe allergic reaction.

Other medications, such as hydrocortisone and diphenhydramine, may also be used to manage allergic reactions but are not the first-line treatments for severe cases. Hydrocortisone is mainly a steroid used for inflammatory conditions, and diphenhydramine is an antihistamine that can help alleviate milder allergic symptoms but does not address the life-threatening aspects of anaphylaxis. Aspirin, while helpful in certain allergic reactions or pain management, is not indicated for treating severe allergic reactions. Thus, epinephrine stands out as the critical drug in these situations.