DOSING: Cetirizine should be taken at doses specifically directed by a physician. Cetirizine can be taken with food.
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.
PRECAUTIONS: Before taking cetirizine, tell your doctor or pharmacist if you are allergic to it; or to hydroxyzine; or if you have any other allergies. Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney disease, liver disease. This drug may make you drowsy; use caution engaging in activities requiring alertness such as driving or using machinery. Limit alcoholic beverages. Caution is advised when using this drug in the elderly because they may be more sensitive to the effects of the drug, especially the drowsiness effect.
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