Antihistamines work by blocking histamine receptors. “Anti-” means “against.” Histamine is a chemical your immune system releases to send messages between different cells. Histamine has several functions, but it’s mainly known for its role in causing allergic and anaphylactic symptoms.

Antihistamines block histamine release from histamine-1 receptors and are mostly used to treat allergies or cold and flu symptoms, although some first-generation antihistamines (also called sedating antihistamines) may be used for other conditions, such as nausea or motion sickness.

Antihistamines suppress the histamine-induced wheal response (swelling) and flare response (vasodilation) by blocking the binding of histamine to its receptors or reducing histamine receptor activity on nerves, vascular smooth muscle, glandular cells, endothelium, and mast cells.

2023年2月16日 · Antihistamines refer to a type of medication that treats allergy symptoms, motion sickness, and some cold and flu symptoms. Antihistamines block H1 histamine...

Antihistamines help to relieve certain allergy symptoms such as itchiness, sneezing, and a runny nose. They’re less effective for other symptoms, such as a stuffed-up nose.

2024年10月19日 · Antihistamines block certain cells in the body from receiving histamine. Histamine is a chemical released by the immune system that causes the symptoms of an allergic reaction. Antihistamine nasal sprays help relieve sneezing, an itchy or runny nose, sinus congestion, and postnasal drip.

2023年6月20日 · Antihistamines are a class of drugs primarily used to relieve allergies. They do so by blocking a chemical known as histamine that is released by the immune system whenever the body is confronted by an allergy-causing substance (allergen).

2024年4月18日 · Antihistamines are medicines that block histamine from binding to your cells, which can make your symptoms better. Antihistamines come in several forms, such as pills, liquids, nasal...

2025年1月8日 · antihistamine, any of a group of synthetic drugs that selectively counteract the pharmacological effects of histamine, following its release from certain large cells (mast cells) within the body.

One type of medicine that helps relieve allergy symptoms is an antihistamine. What are Antihistamines? Antihistamines are medicines that treat allergy symptoms by blocking the effects of histamine. Antihistamines come as pills, chewable tablets, capsules, liquids, nasal sprays, and …