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  2. Anti-allergic agent - Wikipedia

    en.wikipedia.org/wiki/Anti-allergic_agent

    Example of a H-1 antihistamine (Levocetirizine) Side effects. Side effects generally exist more in first-generation antihistamines, for example drowsiness, blurred vision and dry mouth. Other common side effects for all generations include gastrointestinal side effects, headaches and tiredness. [9]

  3. H1 antagonist - Wikipedia

    en.wikipedia.org/wiki/H1_antagonist

    The newer, second-generation H 1-antihistamines are far more selective for peripheral histamine H 1-receptors and have a better tolerability profile compared to the first-generation agents. The most common adverse effects noted for second-generation agents include drowsiness, fatigue, headache, nausea and dry mouth.

  4. Antihistamine - Wikipedia

    en.wikipedia.org/wiki/Antihistamine

    The introduction of the first-generation antihistamines marked the beginning of medical treatment of nasal allergies. [28] Research into these drugs led to the discovery that they were H 1 receptor antagonists and also to the development of H 2 receptor antagonists , where H 1 -antihistamines affected the nose and the H 2 -antihistamines ...

  5. Hydroxyzine - Wikipedia

    en.wikipedia.org/wiki/Hydroxyzine

    It is a first-generation antihistamine in the piperazine family of chemicals. [8] [4] Common side effects include sleepiness, headache, and dry mouth. [8] [9] Serious side effects may include QT prolongation. [9] It is unclear if use during pregnancy or breastfeeding is safe. [8]

  6. Diphenhydramine - Wikipedia

    en.wikipedia.org/wiki/Diphenhydramine

    Diphenhydramine is a first-generation antihistamine used to treat several conditions including allergic symptoms and itchiness, the common cold, insomnia, motion sickness, and extrapyramidal symptoms. [19] [20] Diphenhydramine also has local anesthetic properties, and has been used as such in people allergic to common local anesthetics such as ...

  7. Mepyramine - Wikipedia

    en.wikipedia.org/wiki/Mepyramine

    Mepyramine, also known as pyrilamine, is a first-generation antihistamine, targeting the H 1 receptor as an inverse agonist. [1] Mepyramine rapidly permeates the brain, often causing drowsiness. [2] It is often sold as a maleate salt, pyrilamine maleate.

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