Zyrtec-D is also approved to reduce swollen nasal passages, relieve sinus congestion and pressure, and restore freer breathing through the nose.
Antihistamines block the effects of histamines. Histamines cause symptoms of allergy when released by allergic reactions in the body. Antihistamines block the ability of histamine to promote the allergy symptoms. For further information, please read the Allergic Rhinitis article.
Cetirizine is also used to treat itching and swelling caused by chronic urticaria (hives).
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