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.
Zyrtec belongs to a group of medications known as non-sedating antihistamines, which means it is less likely to cause drowsiness, although people can still experience this side effect when taking the drug.
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