Cetirizine can cause side effects that may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be awake and alert.
Hives (known medically as urticaria) are red, raised welts on the skin. They are usually quite itchy. Hives are commonly caused by allergies, although other factors (such as stress) can also cause them. Some people have hives regularly without finding any cause for their symptoms. Hives usually respond well to antihistamine treatment, although many of the available antihistamines cause drowsiness. Zyrtec is effective for treating the itching due to hives, often without causing drowsiness.
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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