Which drug is commonly used to treat acute allergic reactions?

Antihistamines are commonly used to treat acute allergic reactions because they work by blocking the action of histamine, a substance in the body that is responsible for many of the symptoms associated with allergies. When an allergic reaction occurs, histamine is released, leading to symptoms such as itching, swelling, and increased mucus production. Antihistamines can effectively alleviate these symptoms, providing relief from reactions such as hay fever, hives, or allergic rhinitis. They are available in both over-the-counter and prescription forms, making them accessible for rapid management of allergic symptoms.

Corticosteroids, while effective in treating inflammation associated with allergies, are typically used for more severe or chronic allergic reactions rather than acute scenarios. Decongestants primarily address nasal congestion and are often used in conjunction with antihistamines but do not target the underlying allergic reaction directly. Aspirin is an anti-inflammatory and analgesic medication but does not specifically treat allergic reactions and can even exacerbate asthma in some individuals. Thus, antihistamines stand out as the primary treatment option for immediate relief in acute allergic situations.