How Long Does Zyrtec Take to Work?: Understanding the Onset of Action and Efficacy of Cetirizine

Zyrtec, known generically as cetirizine, is a popular over-the-counter (OTC) antihistamine used to relieve symptoms of allergies, including runny nose, sneezing, itchy or watery eyes, hives, and itching. It belongs to the second generation of antihistamines, which are less likely to cross the blood-brain barrier and cause drowsiness compared to first-generation antihistamines like diphenhydramine. The … Read more