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. 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. 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. Detailed dosage guidelines and administration information for Claritin (loratadine). Includes dose adjustments, warnings and precautions. The Claritin® family of products offers powerful, non-drowsy allergy relief of sneezing, runny nose, itchy, watery eyes and itchy nose or throat. Use as directed. Claritin® offers non-drowsy relief for adults and kids from indoor and outdoor allergy symptoms. Explore Claritin® products and resources for allergy relief. Claritin provides relief of symptoms that can be triggered by over 200 different allergens. Claritin is an antihistamine, so it hinders the cascade triggered by allergens. 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] Claritin (loratadine) is a non-drowsy antihistamine widely used for seasonal allergies. It offers 24‑hour symptom relief with once‑daily dosing and minimal CNS effects for most users. 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.