Betazole

Not to be confused with Betaxolol, a selective β₁-adrenergic receptor antagonist.

Betazole

Names
IUPAC name 2-(1H-pyrazol-5-yl)ethanamine
Identifiers
CAS Number	105-20-4 Y
ChEBI	CHEBI:59170 Y
ChEMBL	ChEMBL1201323 N
ChemSpider	7455 Y
DrugBank	DB00272 Y
IUPHAR/BPS	7126
Jmol 3D model	Interactive image
PubChem	7741
UNII	1C065P542O Y
InChI InChI=1S/C5H9N3/c6-3-1-5-2-4-7-8-5/h2,4H,1,3,6H2,(H,7,8) Y Key: JXDFEQONERDKSS-UHFFFAOYSA-N Y InChI=1/C5H9N3/c6-3-1-5-2-4-7-8-5/h2,4H,1,3,6H2,(H,7,8) Key: JXDFEQONERDKSS-UHFFFAOYAY
SMILES n1ccc(n1)CCN
Properties
Chemical formula	C5H9N3
Molar mass	111.145 g/mol
Pharmacology
ATC code	V04CG02
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Betazole (also known as ametazole) is a histamine H₂ receptor agonist. Betazole hydrochloride is known as gastramine and histalog.

It has been used as a gastric stimulant to test for maximal production of gastric secretion activity. The test can be used in diagnosis of diseases such as Zollinger-Ellison syndrome where there is excess acid production, in this case driven by over production of gastrin. The volume of acid secretion is measured following administration of betazole, diagnosis being secretion greater than 60% of the maximal acid secretion following betazole stimulation. This procedure can lead to complications and should be avoided in subjects with coronary artery disease. It is also used in diagnosis of gastritis in association with a test for secretin activity.

Betazole is used as a stimulant in preference to histamine because of its specificity for the H₂ receptor and its advantage of not generating the undesirable side effects that histamine would induce. It therefore does not require concomitant use of antihistaminic compounds to block the actions of histamine at other histamine receptor types.

Its action in stimulating histamine release can be of use when testing the effectiveness of H₂ receptor blocking drugs such as nizatidine.