Which drug is commonly used to treat anaphylaxis?

Epinephrine is the first-line treatment for anaphylaxis due to its ability to rapidly reverse the severe and potentially life-threatening symptoms associated with this allergic reaction. When administered, epinephrine works by causing vasoconstriction, which increases blood pressure, and bronchodilation, which alleviates respiratory distress by relaxing the airways. It also reduces swelling and hives and improves cardiac output. The quick onset of action makes it essential in emergency scenarios where anaphylaxis occurs.

Other medications listed, such as atropine, aspirin, and ibuprofen, do not provide the same immediate and life-saving effects in the context of anaphylaxis. Atropine primarily affects heart rate and is not indicated for allergic reactions. Aspirin and ibuprofen are anti-inflammatory and analgesic medications that can help with mild to moderate pain and inflammation, but they do not address the acute reactions seen in anaphylaxis. Therefore, epinephrine is the only suitable choice for effectively managing this severe allergic reaction.