Cetirizine (Zyrtec) and loratadine (Claritin) are non-drowsy antihistamines used to treat symptoms of allergic reaction such as symptoms of seasonal hay fever (allergic rhinitis) such as sneezing, runny nose, and red/watery/itchy eyes. Both cetirizine and loratadine are available over-the-counter (OTC) and in generic form, and have children's versions available. Zyrtec (cetirizine) can lower your ability to focus, think, and react. Avoid activities that need your focus, such as driving a car or operating machinery, until you know how this medication affects you. If you are also taking sedatives or medications for anxiety or stress, discuss with your healthcare provider before using Zyrtec (cetirizine). Increased side effects in certain people. Risk. It is possible to overdose on Zyrtec (cetirizine), just like any medication. Fortunately, if you accidentally take an extra dose or two, the side effects are relatively mild and are generally not serious. The prescribing information for Zyrtec notes two cases studies in which an overdose was observed in an adult and pediatric patient: In one case study of an adult overdose, 150mg was taken (15. Zyrtec, generic cetirizine; Plus Side. Causes less sedation than older allergy medicines, like Benadryl. It is long-acting and lasts up to 24 hours. Downside. Doesn't control allergy symptoms as well as older allergy medicines. Use cetirizine mainly if drowsiness from Benadryl interferes with function. Cost. Use a store brand of cetirizine. Reason: Costs less than brand name, Zyrtec. Use in. Cetirizine, sold under the brand name Zyrtec among others, is a second-generation antihistamine used to treat allergic rhinitis (hay fever), dermatitis, and urticaria (hives). It is taken by mouth. Effects generally begin within an hour and last for about a day. The degree of benefit is similar to other antihistamines such as diphenhydramine. Zyrtec (cetirizine) is used to treat allergy symptoms such as sneezing, itching, watery eyes, or runny nose. Includes Zyrtec side effects, interactions and indications. COMMON BRAND NAME(S): Zyrtec. USES: Cetirizine is an antihistamine used to relieve allergy symptoms such as watery eyes, runny nose, itching eyes/nose, sneezing, hives, and itching. It works by blocking a certain natural substance (histamine) that your body makes during an allergic reaction.Cetirizine does not prevent hives or prevent/treat a serious allergic reaction (such as anaphylaxis). If. zyrtec® does not require a prescription for purchase and is available to you without a visit to your doctor. if you have healthcare needs beyond obtaining zyrtec®, please consult your healthcare provider. if you do not have a healthcare provider or cannot access one, teladoc® is available to help. there is no obligation to visit a teladoc® healthcare provider to purchase zyrtec®. Zyrtec should be used during pregnancy only if clearly needed, and it is not recommended for nursing mothers. Additional Information. Our Zyrtec (cetirizine hydrochloride) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication. Suitable for both children & toddlers, this antihistamine liquid medicine is made with 5mg of Cetirizine HCI (in each 5 mL) and features a dye- and sugar-free formula, available in kid-friendly Grape and Bubble Gum flavors. For relief on-the-go, try Children’s ZYRTEC ® Dissolve Tabs for indoor and outdoor seasonal allergies.