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Loratadine

(Science: chemical) a second-generation histamine h1 receptor antagonist used in the treatment of allergic rhinitis and urticaria. Unlike most classical antihistamines it lacks central nervous system depressing effects such as drowsiness.

Pharmacological action: anti-allergic agents, antipruritics, histamine h1 antagonists.

chemical name: 1-Piperidinecarboxylic acid, 4-(8-chloro-5,6-dihydro-11H-benzo(5,6)cyclohepta(1,2-b)pyridin-11-ylidene)-, ethyl ester