Is cetirizine more effective than placebo for allergies?

Jun 5, 2019 ... Zyrtec works for 24 hours with one daily dose, while Benadryl requires multiple doses throughout the day due to its shorter 4-6 hour duration. Cetirizine is a second generation antihistamine with a longer duration of action and less sedation than diphenhydramine. For this reason, second-generation H1 antihistamines like Cetirizine (Zyrtec®) are preferred. Famotidine (Pepcid®) is an example of an H2 antihistamine that ... Cetirizine is an antihistamine medicine 1 used to relieve allergy symptoms caused by hay fever and hives 2 . It's also a non-drowsy antihistamine for most ... Cetirizine ... Cetirizine is a second-generation antihistamine used to treat allergic rhinitis (hay fever), dermatitis, and urticaria (hives). ... It is taken by ... Cetirizine dihydrochloride and cetirizine hydrochloride work exactly the same way when treating hay fever and allergies. The difference between these lies ... Mar 30, 2025 ... Cetirizine is primarily used to treat allergic conditions such as hay fever, allergic rhinitis, and urticaria (hives). Oct 1, 2024 ... What is cetirizine? Cetirizine is an antihistamine. Antihistamines are medications that have been used to treat symptoms of allergies, like ... This article compares Allegra, Claritin, and Zyrtec by looking at how quickly they work, recommended dosages, and side effects. Unlike the first-generation antihistamines, cetirizine and other second-generation antihistamines do not readily enter the brain from the blood, and, therefore, ...