Antihistamines are typically used during which type of reactions?

Antihistamines are primarily utilized in the treatment of allergic reactions. When an allergen triggers the immune system, it can lead to the release of histamine, a compound that causes various symptoms such as itching, swelling, and redness. Antihistamines work by blocking the receptors that histamine binds to, thereby mitigating these allergic symptoms.

In situations involving allergic reactions, antihistamines can effectively relieve discomfort and reduce the physiological effects of histamine. This makes them a crucial pharmacological tool in managing conditions like hay fever, allergic rhinitis, and other allergy-related symptoms. Their role is specifically tied to counteracting the body's hypersensitive responses to allergens, which distinguishes their use from other types of reactions, such as infections or inflammation.