If you have any questions, consult your pharmacist. If your doctor has prescribed this medication, take it as directed, usually once daily ... US residents can call 1-800-222-1222.

You may want to give Zyrtec to your dog ... If you want to take extra precautions to avoid sedative effects on your dog, ...

Even a small amount above the directed prescription can cause serious issues. Once you have admitted Zyrtec to your cat, it will take about 1 or 2 hours for the medication to go into effect.