LBP is a systemic antihistamine and is not recommended for long-term use. The duration of use varies greatly for different diseases, from 3-4 days for short periods to more than 2 months for long periods. Leratadine tablets are used to relieve chronic idiopathic urticaria and perennial allergic rhinitis. Long-term use can cause some damage to the liver and kidneys, so long-term use is not recommended. Several common diseases dosing time can refer to the following, but it is recommended to use it reasonably under the guidance of a physician: 1. Urticaria: If the patient has acute urticaria, it will usually improve after 1-2 weeks of oral intake. When suffering from chronic urticaria oral loratadine tablets may need to be taken orally for 1-2 months; 2. Eczema: it can be controlled within a short period of time and can usually be stopped in about 1 week. If patients form subacute eczema, they can continue to take the drug orally and may need to take it orally for 1 month in some cases; 3. Acute allergic dermatitis: usually controlled within 3-4 days with oral loratadine tablets. Patients using loratadine LBP tablets for the first time are advised to consult a doctor promptly after 1-2 weeks of medication and decide whether medication adjustment is needed according to changes in symptoms. Usually, the medication should be discontinued gradually after the condition improves. If the symptoms do not improve after 1 month or more, it is recommended to switch to other anti-allergic drugs. Use with caution in patients with hepatic insufficiency, abnormal bladder function, urinary retention, increased urethral tone, prostatic hypertrophy, etc. Patients with glaucoma should use with caution. It is not recommended for children under 12 years of age, pregnant and lactating women. Adverse reactions of loratadine citrate tablets mainly include dry mouth, drowsiness, sleepiness and weakness, etc. Rarely, tachycardia, palpitations, elevated transaminases and increased bilirubin need to be monitored during the use of the drug.