这个词是什么意思？
A histamine H1 antagonist used in allergic reactions, hay fever, rhinitis, urticaria, and asthma. It has also been used in veterinary applications. One of the most widely used of the classical antihistaminics, it generally causes less drowsiness and sedation than PROMETHAZINE.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002744 · MeSH 2026。
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