Loratadine is a second-generation antihistamine used to treat allergic rhinitis, hives, and other allergic reactions. It works by blocking the action of histamine, a substance produced by the body in response to an allergic reaction. Loratadine is available in various forms, including tablets, capsules, syrups, and chewable tablets. It is a non-drowsy antihistamine and is generally well-tolerated by most people. However, it may cause side effects such as drowsiness, dry mouth, and headache in some individuals.