is an antihistamine that treats symptoms such as itching, runny nose, watery eyes, and sneezing from "hay fever" and other allergies. It is also used to relieve itching from hives. does not prevent hives or prevent/treat a serious allergic reaction (anaphylaxis). ?The Claritin 10 mg family of products offers powerful, non-drowsy allergy relief of sneezing, runny nose, itchy, watery eyes and itchy nose or throat.If it's caused by allergies, an allergy medication like Claritin can help dry out the mucus that causes congestion, coughing, and a sore throat. Other medications like nasal sprays, Mucinex, and Sudafed might be used if postnasal drip is being caused by a cold or the flu.Claritin 10 mg.