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

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

    Drug interactions aren’t common with Zyrtec, according to the FDA, Dr. Brooks says you’ll want to be careful about using other medications that can cause drowsiness at the same time. Claritin

  3. It's Not in Your Head: Doctors Say Allergy Season Is ... - AOL

    www.aol.com/not-head-doctors-allergy-season...

    Zyrtec might cause drowsiness for some people, Dr. Younus says. Claritin is non-drowsy, but he says some people don’t think it’s as effective as Zyrtec. Allegra is also non-drowsy, but some ...

  4. Cetirizine - Wikipedia

    en.wikipedia.org/wiki/Cetirizine

    The degree of sleepiness that occurs is generally less than with first-generation antihistamines because second-generation antihistamines are more selective for the H1 receptor. [7] [5] Compared to other second-generation anti-histamines, cetirizine can cause drowsiness. [7]

  5. Levocetirizine - Wikipedia

    en.wikipedia.org/wiki/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] Common side effects include sleepiness, dry mouth, cough, vomiting, and ...

  6. H1 antagonist - Wikipedia

    en.wikipedia.org/wiki/H1_antagonist

    H. 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. Pseudoephedrine - Wikipedia

    en.wikipedia.org/wiki/Pseudoephedrine

    Nasal congestion. Pseudoephedrine is a sympathomimetic and is well-known for shrinking swollen nasal mucous membranes, so it is often used as a decongestant. It reduces tissue hyperemia, edema, and nasal congestion commonly associated with colds or allergies.

  8. 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 ...

  9. Cetirizine/pseudoephedrine - Wikipedia

    en.wikipedia.org/wiki/Cetirizine/pseudoephedrine

    Cetirizine/pseudoephedrine. Cetirizine/pseudoephedrine ( Zyrtec-D) is an antihistamine and decongestant formulation. It is a fixed-dose combination drug containing 5 mg cetirizine hydrochloride and 120 mg pseudoephedrine hydrochloride for symptoms related to seasonal allergic rhinitis. [1] [2] [3] Cetirizine/pseudoephedrine gained approval from ...

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