FAMOTI디NE

Pharmaceuticals -> Listed in ZINC15

Pharmaceuticals -> Gastric and Ulcer Drugs

Pharmaceuticals

-0.64

-0.56

174.3 Ų [M+Na]+ [CCS Type: DT; Buffer gas: N2; Ionization: ESI+; Dataset: TOXCAST; Source Identifier: DTXSID5023039]

171.05 Ų [M+Na]+ [CCS Type: TW; Method: calibrated with polyalanine and drug standards]

167.2 Ų [M+H]+ [CCS Type: TW; Method: calibrated with polyalanine and drug standards]

165.9 Ų [M+H]+ [CCS Type: TW; Method: Major Mix IMS/Tof Calibration Kit (Waters)]

Famotidine decreases the production of gastric acid, suppresses acid concentration and pepsin content, and decreases the volume of gastric secretion. Famotidine inhibits both basal and nocturnal gastric acid secretion, as well as acid secretion stimulated by food, caffeine, insulin, and pentagastrin. Famotidine has a dose-dependent therapeutic action, with the highest dose having the most extended duration of action and the highest inhibitory effect on gastric acid secretion. Following oral administration, the onset of action is within one hour, and the peak effect is reached within 1-3 hours. The duration of effect is about 10-12 hours.

Histamine acts as a local hormone that stimulates the acid output by parietal cells via a paracrine mechanism. Neuroendocrine cells called enterochromaffin-like (ECL) cells lie close to the parietal cells and regulate the basal secretion of histamine. Histamine release is also promoted from stimulation by acetylcholine and gastrin, a peptide hormone. Gastrin (G) cells release gastrin, which works on CCK₂ receptors on ECL cells. This action promotes the release of histamine from ECL cells. Upon release, histamine acts on H₂ receptors expressed on the basolateral membrane of parietal cells, leading to increased intracellular cAMP levels and activated proton pumps on parietal cells. Proton pump releases more protons into the stomach, thereby increasing the secretion of acid. In conditions that are associated with acid hypersecretion such as ulcers, there is a loss of regulation of acid secretion. Famotidine works on H₂ receptors and blocks the actions of histamine.