Side Effects Zyrtec is usually well tolerated by dogs and doesn’t cross the blood-brain barrier, making sedative effects far ...

Moreover, if you don't administer the right dosage, it could also be harmful to your dog. Over-the-counter antihistamines such as Claritin (loratadine) and Zyrtec (cetirizine) can be used to treat ...

You may report side effects to FDA at 1-800-FDA-1088. Use Zyrtec Liquid Gels (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or ...