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. Both Claritin and Claritin D are antihistamines that are used to help treat your allergy symptoms. Claritin D also contains a decongestant that can help alleviate the symptoms of sinus pressure and nasal congestion. Both products are available over-the-counter. 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. Discover how Claritin can help manage your allergy symptoms with fewer side effects like drowsiness. This article explores its uses, effectiveness, and how it compares to other antihistamines. 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. Allergy relief options including Claritin and loratadine alternatives. Browse formats and quantities for your needs. 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. 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® offers non-drowsy relief for adults and kids from indoor and outdoor allergy symptoms. Explore Claritin® products and resources for allergy relief. 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.