Usually, children are not recommended to take Keratan for more than 3 consecutive weeks. The drug name of Coretan is loratadine tablets, which is a second generation antihistamine and can be used mainly for various types of allergic reactions, such as allergic rhinitis and allergic rash. Since it does not have a central sedative effect, it can be used clinically in children. However, such drugs should not be taken for a long time, otherwise drug resistance will develop, and combined with weakness, drowsiness, headache and other adverse reactions, may also cause some damage to kidney function. For common allergic rhinitis, it is recommended that the drug can be stopped after the symptoms of sneezing and runny nose disappear, and the duration of taking the drug is about 5-7 days. For allergic rash, it is clinically recommended to discontinue the drug when the rash disappears, about 1 week. In conclusion, it is best for children to take Keratan for no more than 3 weeks, and the patient’s family can take it intermittently under the guidance of a doctor. In addition, when taking this drug must be combined with the instructions for use, not blindly use, once the discomfort should be timely communication with the clinician.