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 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...

2023年4月17日 · 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.

2025年1月14日 · 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.

2023年12月26日 · Antihistamines are a class of medication used short-term or long-term to treat allergic conditions such as hay fever, hives, and swelling under the skin.

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 …

2022年10月11日 · Antihistamines are medicines used to treat hay fever. They can also be used for various other problems. For example: Hives (urticaria). Itching (pruritus). Feeling sick (nausea) and being sick (vomiting). Severe allergic reactions (anaphylaxis). What conditions are antihistamines used to treat?

Antihistamines block the effects of a substance called histamine in your body. Histamine is normally released when your body detects something harmful, such as an infection. It causes blood vessels to expand and the skin to swell, which helps protect the body.