Zyrtec (Cetirizine) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Zyrtec (cetirizine) is used to treat allergy symptoms such as sneezing, itching, watery eyes, or runny nose. Includes Zyrtec side effects, interactions and indications. Cetirizine (Zyrtec) is an antihistamine. It's used for relief of allergy symptoms, such as runny nose or watery eyes, in adults and children. Cetirizine (Zyrtec) is also a safe option for people who are pregnant. This medication is available in different formulations, including tablets and liquid solutions. Typically, cetirizine (Zyrtec) is taken by mouth once per day. The most common side. Cetirizine is a second-generation peripherally selective antihistamine used to treat allergic rhinitis (hay fever), dermatitis, urticaria (hives), and runny nose. [11] It is taken by mouth. [12] Effects generally begin within thirty minutes and last for about a day. [12] The degree of benefit is similar to other antihistamines such as diphenhydramine, which is a first-generation antihistamine. What do Zyrtec products treat? Zyrtec products are commonly used to treat allergy symptoms such as runny nose, itchy/watery eyes, sneezing, or an itchy nose or throat. The main active ingredient. GoodRx compares Zyrtec vs. Claritin vs. Allegra to help you choose the best over-the-counter (OTC) antihistamine to treat your allergy symptoms. Get allergy relief with ZYRTEC® Antihistamine Tablets with 10 mg Cetirizine HCl. These allergy tablets help relieve your indoor & seasonal allergy symptoms. Cetirizine treats cold or allergy symptoms such as sneezing, itching, watery eyes, or runny nose. Includes cetirizine side effects, interactions and indications. Find powerful 24-hour relief from allergies & indoor & outdoor symptoms with the help of ZYRTEC® products. Explore here to find allergy tips, info & products. Find patient medical information for Cetirizine (Zyrtec) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings.