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  2. Cetirizine - Wikipedia

    en.wikipedia.org/wiki/Cetirizine

    Cetirizine acts as a highly selective antagonist of the histamine H 1 receptor. [3] The K i values for the H 1 receptor are approximately 6 nM for cetirizine, 3 nM for levocetirizine, and 100 nM for dextrocetirizine, indicating that the levorotatory enantiomer is the main active form. [3]

  3. H1 antagonist - Wikipedia

    en.wikipedia.org/wiki/H1_antagonist

    H 1 antagonists, also called H 1 blockers, are a class of medications that block the action of histamine at the H 1 receptor, helping to relieve allergic reactions. Agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines ; other agents may have antihistaminergic action but are ...

  4. Histamine H1 receptor - Wikipedia

    en.wikipedia.org/wiki/Histamine_H1_receptor

    The H 1 receptor is a histamine receptor belonging to the family of rhodopsin-like G-protein-coupled receptors. This receptor is activated by the biogenic amine histamine . It is expressed in smooth muscles , on vascular endothelial cells , in the heart, and in the central nervous system .

  5. Histamine receptor - Wikipedia

    en.wikipedia.org/wiki/Histamine_receptor

    H 1 receptor H1 Receptors: These receptors are primarily located on smooth muscle cells, endothelial cells, and neurons. Activation of H1 receptors mediates various responses, including smooth muscle contraction (leading to bronchoconstriction, intestinal cramping), increased vascular permeability (resulting in edema ), and stimulation of ...

  6. Levocetirizine - Wikipedia

    en.wikipedia.org/wiki/Levocetirizine

    It is classified as a second-generation antihistamine and works by blocking histamine H 1-receptors. [6] [3] Levocetirizine was approved for medical use in the United States in 2007, [3] and is available as a generic medication. [4] In 2022, it was the 152nd most commonly prescribed medication in the United States, with more than 3 million ...

  7. Antihistamine - Wikipedia

    en.wikipedia.org/wiki/Antihistamine

    H 1-antihistamines work by binding to histamine H 1 receptors in mast cells, smooth muscle, and endothelium in the body as well as in the tuberomammillary nucleus in the brain. Antihistamines that target the histamine H 1-receptor are used to treat allergic reactions in the nose (e.g., itching, runny nose, and

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