antihistamine n : a medicine used to treat allergies and hypersensitive reactions and colds; works by counteracting the effects of histamine on a receptor site

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A histamine antagonist is an agent that inhibits action of histamine via histamine receptors. H1 antihistamines are used as treatment for symptoms of allergies, such as runny nose. Allergies are caused by an excessive type 1 hypersensitivity response of the body to allergens, such as pollen released by plants. An allergic reaction, which if severe enough can lead to anaphylaxis, results in excessive release of histamines and other mediators by the body. Other uses of H1 antihistamines help with symptoms of local inflammation that result from various conditions, such as insect stings, even if there is no allergic reaction. Other commonly used examples of antihistamines include the H2 antagonists (cimetidine), which are widely used for the treatment of acid reflux and stomach ulcers, as they decrease gastric acid production.

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  Remeron is an antidepressant that enhances serotonin and norepinephrine, which are linked to weight loss. Yet the antihistamine activity of this drug may tip the scales toward weight gain. This side effect can be a good thing, however. Read more on this news related to 'Antihistamine'
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  At least Kathy Cordes has finished her prednisone prescription. She still must use an antihistamine and two asthma medications — an inhaler and a tablet — every day. And she keeps an albuterol inhaler on hand for emergencies. When you have ... Read more on this news related to 'Antihistamine'