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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.
Zyrtec is a brand name for the drug cetirizine. ... this is a second-generation antihistamine. “The second generation drugs do not pass as readily into the brain and are less sedating,” Dr ...
Pages in category "Antihistamines" The following 45 pages are in this category, out of 45 total. This list may not reflect recent changes. ...
Anti-allergic agents are medications used to treat allergic reactions. Anti-allergic agents have existed since 3000 B.C in countries such as China and Egypt.It was not until 1933 when antihistamines, the first type of anti-allergic agents, were developed. [1]
Chlorphenamine acts primarily as a potent H 1 antihistamine. It is specifically a potent inverse agonist of the histamine H 1 receptor. [22] [23] The drug is also commonly described as possessing weak anticholinergic activity by acting as an antagonist of the muscarinic acetylcholine receptors.
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