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.
Older adults may need to take a lower than normal dose. Follow your doctor's instructions.
On occasion, your healthcare provider may recommend Zyrtec for something other than allergies or hives. Currently, there are no universally accepted off-label Zyrtec uses.
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