Clemastine

**Definition:** A histamine H1 antagonist used as the hydrogen fumarate in hay fever, rhinitis, allergic skin conditions, and pruritus. It causes drowsiness.

**Tree numbers:** - D03.383.773.165

**Synonyms:** - Meclastine - Mecloprodin - 2-(2-(1-(4-Chlorophenyl)-1-phenylethoxy)ethyl)-1-methylpyrrolidine