Histamine Antagonists

**Definition:** Drugs that bind to but do not activate histamine receptors, thereby blocking the actions of histamine or histamine agonists. Classical antihistaminics block the histamine H1 receptors only.

**Tree numbers:** - D27.505.519.625.375.425 - D27.505.696.577.375.425

**Synonyms:** - Antihistamine - Histamine Antagonist - Antihistamines