Overview: Loratadine is an antihistamine that is taken to help treat allergy symptoms, such as a runny nose, itchy or watery eyes, sneezing, or an itchy nose or throat. Common side effects may. Shop items from Claritin at Walmart.com and learn more about how you can save money on the best Claritin products to help you live better. Claritin is an antihistamine used to treat the symptoms of allergies, such as sneezing, watery eyes, and runny nose. Learn about side effects, interactions and indications. The Claritin® family of products provides proven allergy relief from symptoms such as runny, itchy nose, sneezing, itchy, watery eyes and itchy throat that lasts all day- without causing drowsiness. Claritin® offers non-drowsy relief for adults and kids from indoor and outdoor allergy symptoms. Explore Claritin® products and resources for allergy relief. Loratadine, sold under the brand name Claritin among others, is a medication used to treat allergies. [4] This includes allergic rhinitis (hay fever) and hives. [4] Loratadine is used to treat allergy symptoms, including runny or stuffy nose, sneezing, watery eyes, and itching of the eyes, nose or throat. This medicine is available as an over-the-counter (OTC) product. This product is available in the following dosage forms: Claritin package insert / prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions and pharmacology. Loratadine (Claritin) is an antihistamine. It works by blocking histamine. Histamine is a natural chemical in your body that causes allergy symptoms like itchy eyes, a runny nose, and sneezing. By blocking histamine, this medication helps relieve allergy symptoms. Claritin (loratadine) is an antihistamine used to treat allergy symptoms. Claritin blocks the action of histamine, a substance in the body that initiates allergic symptoms like itching, sneezing, runny nose, and allergic skin rashes.