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Antihistamines are drugs which treat allergic rhinitis, common cold, influenza, and other allergies. [1] Typically, people take antihistamines as an inexpensive, generic (not patented) drug that can be bought without a prescription and provides relief from nasal congestion, sneezing, or hives caused by pollen, dust mites, or animal allergy with few side effects. [1]
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 not true antihistamines.
Pages in category "Antihistamines" The following 45 pages are in this category, out of 45 total. This list may not reflect recent changes. ...
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.
Allergy Tablet. Xyzal, a.k.a. levocetirizine, "is the best prescription-strength oral antihistamine," Dr. Li says. It helps with sneezing, a runny or itchy nose or itchy throat, and watery eyes.
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 ...