Overview
Loratadine is approved by the U.S. Food and Drug Administration (FDA) for the relief of symptoms associated with chronic idiopathic urticaria (hives). It is used to temporarily reduce pruritus (itching), the number of hives, and the size of hives. 

Loratadine is an antihistamine that works by blocking histamine, a substance in the body that triggers allergic symptoms such as swelling and itching. By reducing histamine’s effects, loratadine helps relieve skin symptoms associated with hives.

How do I take it?
Prescribing information states that loratadine is taken by mouth once daily. Dosing depends on factors including the age of the person taking the medication. Loratadine is available in several forms, including tablets, chewable tablets, oral disintegrating tablets, capsules, and syrup. The medication should be taken exactly as directed by a healthcare provider.

Side effects
Common side effects of loratadine include headache, drowsiness, tiredness, dry mouth, vomiting, stomach pain, and nervousness or hyperactivity.

Rare but serious side effects may include rash, itching, urticaria, angioedema (swelling of the face, lips, tongue, or throat), and dyspnea (trouble breathing). If these occur, loratadine should be stopped immediately, and medical attention should be sought.

For more information about this treatment, visit:

Loratadine — Drugs.com

Loratadine — MedlinePlus