Clarinex (desloratadine) provides 24‑hour relief with once‑daily dosing and minimal drowsiness for most users. It is used for seasonal/perennial allergic rhinitis and chronic hives. Find patient medical information for Desloratadine (Clarinex) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Complete guide to Clarinex (desloratadine): what it treats, proper dosage, common side effects, drug interactions, and important safety information you need to know. Desloratadine is an antihistamine used to relieve allergy symptoms such as watery eyes, runny nose, itching eyes/nose, sneezing, hives, and itching. It works by blocking a certain natural substance (histamine) that your body makes during an allergic reaction. Desloratadine is an antihistamine. It is used to relieve the symptoms of hay fever and hives of the skin. Antihistamines work by preventing the effects of a substance called histamine, which is produced by the body. Histamine can cause itching, sneezing, runny nose, and watery eyes. Medscape - Indication-specific dosing for Clarinex, Clarinex RediTabs (desloratadine), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation. 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. 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. 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.