Claritin is an over-the-counter medication used to relieve allergy symptoms such as sneezing, runny nose, and itchy eyes. Its active ingredient is loratadine, an antihistamine that works by blocking the action of histamine, a substance in the body that causes allergic reactions. This medication is non-drowsy, making it a popular choice for people who need to manage their allergies without feeling sleepy. Claritin is available in various forms, including tablets, liquid gels, and syrup, and is typically taken once a day for effective relief.