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2. Cetirizine - Wikipedia

   en.wikipedia.org/wiki/Cetirizine

   Cetirizine is a second-generation antihistamine used to treat allergic rhinitis (hay fever), dermatitis, and urticaria (hives). [5] It is taken by mouth. [6] Effects generally begin within thirty minutes and last for about a day. [6] The degree of benefit is similar to other antihistamines such as diphenhydramine, which is a first-generation ...

3. Levocetirizine - Wikipedia

   en.wikipedia.org/wiki/Levocetirizine

   Levocetirizine. Levocetirizine, sold under the brand name Xyzal, among others, is a second-generation antihistamine used for the treatment of allergic rhinitis (hay fever) and long-term hives of unclear cause. [3] It is less sedating than older antihistamines. [4] It is taken by mouth. [3]

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

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

   Side effects of Zyrtec. Zyrtec is a widely available medication that can work quickly. “In the average patient, Zyrtec works at its maximum effect slightly faster — about 45 minutes ...

5. Antihistamine - Wikipedia

   en.wikipedia.org/wiki/Antihistamine

   Antihistamines that target the histamine H 1 -receptor are used to treat allergic reactions in the nose (e.g., itching, runny nose, and sneezing). In addition, they may be used to treat insomnia, motion sickness, or vertigo caused by problems with the inner ear. H 2 -antihistamines bind to histamine H 2 receptors in the upper gastrointestinal ...

6. H1 antagonist - Wikipedia

   en.wikipedia.org/wiki/H1_antagonist

   1. antagonist. H1 antagonists, also called H1 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 ...

7. Loratadine - Wikipedia

   en.wikipedia.org/wiki/Loratadine

   Loratadine, sold under the brand name Claritin among others, is a medication used to treat allergies. [5] This includes allergic rhinitis (hay fever) and hives. [5] It is also available in drug combinations such as loratadine/pseudoephedrine, in which it is combined with pseudoephedrine, a nasal decongestant. [5] It is taken orally.