Clarinex (Desloratadine) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. CLARINEX prescription and dosage information for physicians and health care professionals. Pharmacology, adverse reactions, warnings, and CLARINEXside effects. Clarinex package insert / prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions and pharmacology. Medscape - Indication-specific dosing for Clarinex, Clarinex RediTabs (desloratadine), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation. Find patient medical information for Desloratadine (Clarinex) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Desloratadine (Clarinex) is an antihistamine. It works by blocking histamine, a natural chemical in your body that causes allergy symptoms. By blocking histamine, it helps relieve allergy symptoms like itchy eyes, a runny nose, sneezing, and hives. Desloratadine, sold under the brand name Aerius among others, is a tricyclic H 1 receptor inverse agonist that is used to treat allergies. It is the major active metabolite of loratadine. Desloratadine was patented in 1984 and came into medical use in 2001. [8]. Clarinex, known by the generic name desloratadine, is a non-drowsy antihistamine primarily used to manage symptoms associated with allergic reactions. It functions by blocking the action of histamine, a natural substance in the body that triggers allergic responses. Learn about Clarinex-D (desloratadine / pseudoephedrine) usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Clarinex is an antihistamine that reduces the effects of the natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Clarinex is used to treat the symptoms of allergies, such as sneezing, watery eyes, itching, and runny nose.