What is the main therapeutic use of antihistamines in treating allergies?

Antihistamines primarily function by blocking the effects of histamines, which are chemicals released during an allergic reaction. When an allergen enters the body, the immune system responds by releasing histamines, leading to symptoms such as itching, swelling, and mucus production. By antagonizing the histamine receptors, antihistamines effectively reduce these symptoms, providing relief from various allergic conditions such as hay fever, allergic rhinitis, and certain skin reactions.

Understanding the mechanism of antihistamines highlights their role in allergy management, as they inhibit the actions of histamines rather than preventing their release or addressing pain and inflammation directly. This makes antihistamines crucial for symptomatic relief during allergic episodes.