As mentioned, allergies occur when the body's immune system reacts to normally harmless substances that do not bother most people. This reaction is partly caused by the release of histamine from certain cells in the body. Zyrtec blocks histamine from binding to histamine receptors and causing allergy symptoms. Since histamine is responsible for many of the symptoms of allergies, blocking it can be helpful. It is important to note that antihistamines (including Zyrtec) do not help treat nasal congestion caused by allergies, since this symptom is not due to histamine.
Cetirizine Tablets are a nonprescription drug approved for the temporary relief of symptoms due to hay fever or other respiratory allergies (sneezing; runny nose; itchy, watery eyes; itchy throat or nose) in adults and children 2 years of age and older. Cetirizine Tablets are also approved for the relief of itching due to hives in adults and children 6 years of age and older.
HOW TO USE: Take this medication by mouth once a day; or use as directed by your doctor. This drug may be taken with or without food. The chewable tablet form of this medication may be taken with or without water. Do not increase your dose or take this more often than directed. Do not take this medication for several days before allergy testing since test results can be affected.
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