How many days to take loratadine tablets varies from person to person, and the drug can be stopped until the allergic symptoms disappear. Loratadine is a highly effective and long-lasting tricyclic antihistamine, a selective peripheral H1 receptor antagonist. It can relieve various symptoms caused by allergic reactions, such as sneezing, runny nose, itchy nose, nasal congestion, as well as itching and burning sensation in the eyes and other symptoms. The above allergic symptoms can be relieved rapidly after oral administration of this drug medication. After the patient’s symptoms are relieved, the drug can be discontinued according to the condition, or appropriately extend the duration of the drug to consolidate the efficacy of the treatment. Common adverse reactions to loratadine include fatigue, headache, drowsiness, dry mouth, gastrointestinal disturbances including nausea, gastritis, and skin rashes. Rare adverse reactions may include alopecia, allergic reactions, liver function abnormalities, tachycardia and palpitations. Loratadine needs to be taken under the supervision of a physician and should not be used without authorization.