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The long-acting, over-the-counter medication lasts up to 24 hours per dose, according to the Food and Drug Administration (FDA). It reaches peak concentration in your body an hour after you take ...
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.
Benadryl is a brand of various antihistamine medications used to stop allergies, ... In 1982 it was approved as an over-the-counter medication. [24]
Antihistamine medications, including pills, nose sprays and eye drops, can typically be used on more of an as-needed basis than the steroid sprays, Reisacher explains. ... Many over-the-counter ...
Chlorphenamine (CP, CPM), also known as chlorpheniramine, is an antihistamine used to treat the symptoms of allergic conditions such as allergic rhinitis (hay fever). [2] It is taken orally (by mouth). [2] The medication takes effect within two hours and lasts for about 4–6 hours. [2]
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