How to use Zyrtec:
Use Zyrtec as directed by your doctor. Check the label on the medicine for exact dosing instructions.

* Take Zyrtec by mouth with or without food.
* If you miss a dose of this medicine, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Ask your health care provider any questions you may have about how to use Zyrtec.

Possible side effects of Zyrtec:
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

* Drowsiness; dry mouth; stomach pain (in children); tiredness; trouble sleeping (in children).
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