H1 antagonist
DRUGS THAT BLOCK THE ACTION OF HISTAMINE AT THE H1 RECEPTOR HELPING TO RELIEVE ALLERGIC REACTIONS
Histamine h1 antagonists; Classical antihistamine; Histamine H1 antagonist; H1-receptor antagonists; H1-receptor antagonist; H1 antihistamines; H1 antihistamine; First generation antihistamine; 1st generation antihistamine; First-generation antihistamine; Second-generation antihistamine; Second generation antihistamine; 2nd generation antihistamine; 2nd-generation antihistamine; 3rd-generation antihistamine; 3rd generation antihistamine; Third generation antihistamine; Third-generation antihistamine; 1st-generation antihistamine; Typical antihistamine; Atypical antihistamine; H1 blocker; H1 antagonists; Second generation antihistamines; H1 receptor antagonists
H1 antagonists, also called H1 blockers, are a class of medications that block the action of histamine at the H1 receptor, helping to relieve allergic reactions. Agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines; other agents may have antihistaminergic action but are not true antihistamines.