Loratadine is not very stimulating to the stomach and may cause mild gastrointestinal irritation, and patients may experience nausea, vomiting, and indigestion. Although loratadine is not very stimulating to the stomach, it has a relatively common adverse effect, that is, it tends to cause central depression, patients may experience dizziness, weakness, drowsiness, etc. Therefore, during the use of loratadine, it is not recommended to use other drugs with central depressant effects, such as some sedative, hypnotic drugs, during the use of this drug is best not to drive, do not work at height and engage in It is best not to drive, work at high altitudes or engage in delicate work while using this drug. There are various forms of loratadine, such as loratadine tablets and loratadine dry suspension. Loratadine belongs to the third generation of anti-allergic drugs, and its class of drugs include cetirizine hydrochloride, levocetirizine hydrochloride, desloratadine, etc.