Zyrtec is a brand name for Cetrizine, an antihistamine medication. It is used in allergic disorders. People often confuse COVID -19 symptoms and allergies, especially in areas where there the pollen season has started and seasonal allergy is prevalent. However, allergic symptoms would include sneezing, runny nose, stuffy nose (nasal congestion), or itchy, watery eyes. Allergies don’t usually cause fever and are not usually accompanied by an aching body which might be more indicative of viral infections such as COVID -19.