We’ll explain how much Zyrtec you can take, Zyrtec dosing by age and formulation, the maximum safe dosage, what happens if you take too much Zyrtec, and when to see your healthcare provider. Boston Children's Health Physicians Cetirizine Dosing Chart Antihistamine Dosing for Allergies and Hives: Once-daily dosing unless noted. Use only one antihistamine at a time. Always double-check concentration on the bottle. Medscape - Allergic rhinitis, urticaria-specific dosing for Zyrtec, Quzyttir (cetirizine), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation. Read on for Zyrtec dosage information, including typical dosage, adjustments for health conditions, and what to do if you miss a dose. Whether you need to know ZYRTEC ® dosages for adults or children, check out our dosing charts and FAQs for the ZYRTEC ® family of products, to find all the information you need. Learn about the correct dosage for ZYRTEC® cetirizine products for both children & adults. Plus, find answers to common ZYRTEC® dosing-related questions. Take Zyrtece xactly as directed. Follow all directions on your prescription label and read all medication guides or instruction sheets. Zyrtec can be taken with or without food. You must chew the chewable tablet before you swallow it. Find the recommended dose to safely give your child based on weight and age with the St. Louis Children's Hospital infant and child medication dosage table. The typical cetirizine dose for allergies and hives is 5 to 10 milligrams (mg). Cetirizine comes in several oral forms and is usually taken once per day. Detailed dosage guidelines and administration information for Zyrtec (cetirizine hydrochloride). Includes dose adjustments, warnings and precautions.