Clarityn 10mg Loratidine Tablets (30). What is Clarityn and what is it used for?. Clarityn relieves symptoms associated with allergic rhinitis (for example, hay fever) such as:. sneezing. runny or itchy nose. burning or itchy eyes. Clarityn may also be used to help relieve symptoms of urticaria (itching, redness and number and size of hives).