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  2. Diphenhydramine - Wikipedia

    en.wikipedia.org/wiki/Diphenhydramine

    Diphenhydramine, sold under the brand name Benadryl among others, is an antihistamine and sedative.It is a first-generation H 1-antihistamine and it works by blocking certain effects of histamine, which produces its antihistamine and sedative effects.

  3. Doxylamine - Wikipedia

    en.wikipedia.org/wiki/Doxylamine

    The first-generation sedating antihistamines diphenhydramine, doxepin, doxylamine, and pyrilamine are the most widely used medications in the world for preventing and treating insomnia. [6] As of 2004, doxylamine and diphenhydramine, which are both over-the-counter medications, were the agents most commonly used to treat short-term insomnia. [11]

  4. Olopatadine - Wikipedia

    en.wikipedia.org/wiki/Olopatadine

    Olopatadine, sold under the brand name Patanol among others, is an antihistamine medication used to decrease the symptoms of allergic conjunctivitis and allergic rhinitis (hay fever). [2] It is used as eye drops or as a nasal spray. [2] The eye drops generally result in an improvement within half an hour. [2]

  5. Which Allergy Medicine Is Actually Most Effective? - AOL

    www.aol.com/lifestyle/allergy-medicine-actually...

    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 ...

  6. Anti-allergic agent - Wikipedia

    en.wikipedia.org/wiki/Anti-allergic_agent

    Another type of antihistamines known as H2-antihistamines are used to treat gastrointestinal conditions caused by excessive stomach acid. [8] Mechanism. H-1 antihistamines work by inhibiting histamine from binding to H-1 receptors. Histamine receptors expressed in smooth muscles, vascular endothelial cells, the heart, and the central nervous ...

  7. Antihistamine - Wikipedia

    en.wikipedia.org/wiki/Antihistamine

    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]

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