Loratadine is a medication for the treatment of allergic rhinitis and urticaria, and patients are usually advised to take it for no longer than 2 weeks to avoid adverse reactions. Loratadine tablets are commonly used to relieve the symptoms associated with allergic rhinitis, such as sneezing, nasal itching, nasal congestion, runny nose, and itching and burning sensation in the eyes. Patients usually experience rapid relief of nasal and eye symptoms after oral administration of loratadine. This drug is also used to treat pruritic skin conditions, chronic urticaria, and other allergic skin conditions. For the treatment of acute urticaria, patients need to take the drug orally for seven days and then stop using it after the disease is cured. For the treatment of chronic urticaria, the oral duration is relatively longer, but the duration of the drug should not exceed 2 weeks, and long-term use may lead to adverse reactions, such as drowsiness, dry mouth, headache and gastrointestinal discomfort. Patients should also pay attention to the monitoring of liver and kidney function to avoid organ damage during medication. In addition, patients are advised to consume as little seafood and spicy food as possible in daily life to avoid aggravation of allergy.