Chemical Component Summary

FormulaC5 H9 N3
Molecular Weight111.14
Isomeric SMILESNCCc1c[nH]cn1

Chemical Details

Formal Charge0
Atom Count17
Chiral Atom Count0
Chiral Atomsn/a
Bond Count17
Aromatic Bond Count5
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB05381 Different stereochemistry
  • approved
  • investigational
DescriptionA depressor amine derived by enzymatic decarboxylation of histidine. It is a powerful stimulant of gastric secretion, a constrictor of bronchial smooth muscle, a vasodilator, and also a centrally acting neurotransmitter.
  • 1H-Imidazole-4-ethanamine
  • 2-(4-imidazolyl)ethylamine
  • 4-imidazoleethylamine
  • 5-imidazoleethylamine
  • beta-aminoethylglyoxaline
  • Histamine dihydrochloride
  • Histamine phosphate
Brand Names
  • Abee Med
  • Activon Ultra Strength Arthritis
  • Alo Therapeutic Massage
  • Alo Therapeutic Massage Pain Relie
Affected OrganismHumans and other mammals
IndicationHistamine phosphate is indicated as a diagnostic aid for evaluation of gastric acid secretory function.
PharmacologyHistamine stimulates gastric gland secretion, causing an increased secretion of gastric juice of high acidity. This action is probably due mainly to a direct action on parietal and chief gland cells.
Mechanism of actionHistamine acts directly on the blood vessels to dilate arteries and capillaries; this action is mediated by both H 1- and H 2-receptors. Capillary dilatation may produce flushing of the face, a decrease in systemic blood pressure, and gastric gland secretion, causing an increased secretion of gastric juice of high acidity. Increased capillary permeability accompanies capillary dilatation, producing an outward passage of plasma protein and fluid into the extracellular spaces, an increase in lymph flow and protein content, and the formation of edema. In addition, histamine has a direct stimulant action on smooth muscle, producing contraction if H 1-receptors are activated, or mostly relaxation if H 2-receptors are activated. Also in humans, the stimulant effect of histamine may cause contraction of the intestinal muscle. However, little effect is noticed on the uterus, bladder, or gallbladder. Histamine has some stimulant effect on duodenal, salivary, pancreatic, bronchial, and lacrimal glands. Histamine also can bind to H3 and H4 receptors which are involved in the CNS/PNS neurotransmitter release and immune system chemotaxis, respectively.
Route of administration
  • Intradermal
  • Percutaneous
  • Subcutaneous
  • Topical
  • Adjuvants, Immunologic
  • Antineoplastic and Immunomodulating Agents
  • Cytochrome P-450 CYP2C9 Inhibitors
  • Cytochrome P-450 CYP2C9 Substrates
  • Cytochrome P-450 CYP2D6 Inhibitors
  • 36:36.00
  • 36:89.00*
CAS number51-45-6
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682