Search on: HISTAMINE ANTAGONISTS 
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Descriptor English:   Histamine Antagonists 
Descriptor Spanish:   Antagonistas de los Receptores Histamínicos 
Descriptor Portuguese:   Antagonistas dos Receptores Histamínicos 
Synonyms English:   Antagonists, Histamine
Antihistamines  
Tree Number:   D27.505.519.625.375.425
D27.505.696.577.375.425
Definition English:   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. 
Indexing Annotation English:   GEN or unspecified; prefer specifics; do not confuse with HISTAMINE AGONISTS
History Note English:   1977; for ANTIHISTAMINES use HISTAMINE H1 ANTAGONISTS 1997-2008 
Allowable Qualifiers English:  
AD administration & dosage AE adverse effects
AN analysis BL blood
CF cerebrospinal fluid CS chemical synthesis
CH chemistry CL classification
EC economics HI history
IM immunology IP isolation & purification
ME metabolism PK pharmacokinetics
PD pharmacology PO poisoning
RE radiation effects ST standards
SD supply & distribution TU therapeutic use
TO toxicity UR urine
Record Number:   6792 
Unique Identifier:   D006633 

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