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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]

3. Cetirizine/pseudoephedrine - Wikipedia

   en.wikipedia.org/wiki/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 .

4. Levocetirizine - Wikipedia

   en.wikipedia.org/wiki/Levocetirizine

   Levocetirizine is an antihistamine. It acts as an inverse agonist that decreases activity at histamine H1 receptors. This in turn prevents the release of other allergy chemicals and increases the blood supply to the area, providing relief from the typical symptoms of hay fever.

5. Pseudoephedrine - Wikipedia

   en.wikipedia.org/wiki/Pseudoephedrine

   Unifed (made by United Pharmaceutical Manufacturer, Jordan) — contains pseudoephedrine hydrochloride (also triprolidine and guaifenesin). Zyrtec-D 12 Hour (made by McNeil Consumer Healthcare, a Kenvue company) — contains 120 mg pseudoephedrine hydrochloride (also 5 mg of cetirizine).

6. Hydroxyzine - Wikipedia

   en.wikipedia.org/wiki/Hydroxyzine

   Hydroxyzine is supplied mainly as a dihydrochloride salt (hydroxyzine hydrochloride) but also to a lesser extent as an embonate salt (hydroxyzine pamoate). [ 56 ] [ 57 ] [ 58 ] The molecular weights of hydroxyzine, hydroxyzine dihydrochloride, and hydroxyzine pamoate are 374.9 g/mol, 447.8 g/mol, and 763.3 g/mol, respectively. [ 4 ]

7. H1 antagonist - Wikipedia

   en.wikipedia.org/wiki/H1_antagonist

   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.