Loratadine and Keratan are actually the same drug, different names of the same drug. Loratadine is the generic name of the drug and Keratan is the trade name of the drug, which is mainly used clinically for the treatment of allergic rhinitis, allergic conjunctivitis, skin urticaria and other allergic diseases. It is mainly used clinically in the ENT department for the treatment of sneezing, runny nose, itchy nose and other related symptoms, as well as the treatment of allergic conjunctivitis induced by allergic rhinitis. This drug is a second-generation antihistamine with fewer side effects and less central inhibition than first-generation antihistamines, but there are some patients who experience mild drowsiness, thirst and other related discomforts after using the drug. Clinically, it is a prescription drug and should be applied under the guidance of a clinician.