What effect do antihistamines have on allergic reactions?

Antihistamines play a crucial role in managing allergic reactions by inhibiting the action of histamine, a substance released during allergic responses. When someone is exposed to an allergen, histamine is released from mast cells and basophils, leading to symptoms such as itching, swelling, redness, and increased mucus production. By blocking the histamine receptors, antihistamines effectively reduce these symptoms, thereby alleviating the discomfort associated with allergies.

In addition to reducing symptoms, antihistamines may also have some anti-inflammatory effects, which can help in lessening the overall impact of an allergic reaction. However, it’s important to note that while antihistamines can significantly reduce the intensity of allergic reactions, they do not completely eliminate allergies, as the root cause remains the immunological response to allergens.

The other choices suggest incorrect effects of antihistamines; they do not enhance allergic reactions, they do not eliminate the presence of allergies, nor do they trigger skin sensitivities. Thus, option B correctly identifies the primary function of antihistamines in the context of allergic reactions.