Cetirizine, the active ingredient of Zyrtec ... One 10-mg tablet every 24 hours (maximum 10 mg per day) One to two 5-mg chewable tablets every 24 hours (maximum 10 mg per day) Recommended dose ...
You can safely give Zyrtec to your dog up to 20 mg per day. It should only be administered orally. You can see a quick ...