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  2. H3 receptor antagonist - Wikipedia

    en.wikipedia.org/wiki/H3_receptor_antagonist

    An H 3 receptor antagonist is a type of antihistaminic drug used to block the action of histamine at H 3 receptors.. Unlike the H 1 and H 2 receptors which have primarily peripheral actions, but cause sedation if they are blocked in the brain, H 3 receptors are primarily found in the brain and are inhibitory autoreceptors located on histaminergic nerve terminals, which modulate the release of ...

  3. 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 ...

  4. Anti-allergic agent - Wikipedia

    en.wikipedia.org/wiki/Anti-allergic_agent

    Third generation antihistamines are metabolites of the second-generation antihistamines but without cardiac toxicity. [8] Indications and route of administration. Antihistamines are generally indicated for the alleviation of conditions such as allergic rhinitis, allergic conjunctivitis, or atopic dermatitis. [9]

  5. Which Allergy Medicine Is Actually Most Effective? - AOL

    www.aol.com/lifestyle/allergy-medicine-actually...

    Like Zyrtec, this is a second-generation antihistamine. “The second generation drugs do not pass as readily into the brain and are less sedating,” Dr. Alan says. NoDerog - Getty Images

  6. Hydroxyzine - Wikipedia

    en.wikipedia.org/wiki/Hydroxyzine

    Hydroxyzine, sold under the brand names Atarax and Vistaril among others, is an antihistamine medication. [8] It is used in the treatment of itchiness, anxiety, insomnia, and nausea (including that due to motion sickness). [8] It is used either by mouth or injection into a muscle. [8] Hydroxyzine works by blocking the effects of histamine. [9]

  7. Phenbenzamine - Wikipedia

    en.wikipedia.org/wiki/Phenbenzamine

    Phenbenzamine, sold under the brand name Antergan and known by the former developmental code name RP-2339, is an antihistamine of the ethylenediamine class which also has anticholinergic properties. [ 1 ] [ 2 ] It was introduced in 1941 or 1942 and was the first antihistamine to be introduced for medical use.

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