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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 ...
More good news: Over-the-counter allergy medications are as effective as most prescription ones, says Evan Li, MD, an assistant professor of medicine, immunology, allergy, and rheumatology at the ...
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]
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 ]
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.
Over-The-Counter Allergy Eye Drops. ... This drug is an antihistamine, meaning it blocks symptoms by blocking receptors for histamine, a chemical that you make during an allergic reaction that ...
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