What is the function of an antihistamine?

Antihistamines function primarily to decrease the immune system's response to allergens, which can lead to symptoms such as itching, sneezing, and tissue swelling. When the body encounters an allergen, the immune system releases histamine, a substance that contributes to these allergic reactions. Antihistamines work by blocking the action of histamine at its receptor sites, thereby alleviating the symptoms associated with allergic reactions, such as itchiness and swelling.

This mechanism is crucial for managing conditions like allergic rhinitis (hay fever) and urticaria (hives), where histamine release causes significant discomfort. By reducing the effects of histamine, antihistamines help improve the quality of life for individuals affected by these allergies.

Other options don't align with the primary function of antihistamines. Reducing inflammation typically involves corticosteroids or non-steroidal anti-inflammatory drugs, while pain relief is managed through analgesics. Additionally, promoting healing is more closely associated with growth factors or therapies aimed at tissue regeneration rather than the action of antihistamines.