Karelactam is loratadine, so both karelactam and loratadine are one kind of medicine, but they are called by different names. Loratadine is an antihistamine, or what is usually called an anti-allergy drug, and belongs to the third generation of antihistamines, mainly used to relieve nasal congestion, runny nose, sneezing, itchy eyes and other symptoms caused by allergic rhinitis. It can also be used to treat skin allergies such as urticaria, atopic dermatitis, eczema, itchy skin, etc. The use of loratadine is not recommended along with other drugs that have a central inhibitory effect. It is also not recommended to drink alcohol while using loratadine, and it is recommended to use loratadine at night before going to bed.