
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.

If you forget to take your Zyrtec as scheduled, take your missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose.

Tell your doctor if you regularly use other medicines that make you sleepy (such as other cold or allergy medicine, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety). They can add to sleepiness caused by cetirizine.

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