The main clinical differences between loratadine and levocetirizine hydrochloride tablets are as follows: 1. loratadine belongs to the second generation of antihistamines, and levocetirizine hydrochloride belongs to the third generation of antihistamines. 2. levocetirizine hydrochloride tablets have a lower incidence of central, sedative and anticholinergic adverse reactions than loratadine tablets, and are better tolerated by patients. 3. levocetirizine hydrochloride tablets can be used in combination with many drugs. The use of levocetirizine hydrochloride tablets can be combined with many drugs, but loratadine tablets should not be used together with erythromycin and ketoconazole cream, which can lead to an increase in blood concentration. 4. levocetirizine hydrochloride tablets have a wider range of use, while loratadine has a narrower range of application and is not recommended for children in clinical practice.