famotidine   Click here for help

GtoPdb Ligand ID: 7074

Synonyms: Gaster® | MK-208 | Pepcid®
Approved drug
famotidine is an approved drug (FDA (1986))
Compound class: Synthetic organic
Comment: Famotidine is a histamine H2 receptor antagonist. The drug is poorly soluble in the low pH of the stomach so suffers from poor bioavailability. Low dose (10-20 mg) famotidine is available over-the-counter in some countries. Marketing of a combination of famotidine with antacids magnesium hydroxide and calcium carbonate (Pepcidtwo®) has been officially discontinued in the UK (2015).
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2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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Click here for structure editor
Physico-chemical Properties
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Physico-chemical Properties

Calculated molecular properties are available for small molecules and natural products (not peptides). Properties were generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/). All properties were selected to enable the prediction of the Lipinski Rule-of-Five profile or ‘druglikeness’ for each ligand. For more info on each category see the help pages.

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Hydrogen bond acceptors 9
Hydrogen bond donors 4
Rotatable bonds 7
Topological polar surface area 237.75
Molecular weight 337.04
XLogP -1.79
No. Lipinski's rules broken 0

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)

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Canonical SMILES NC(=Nc1scc(n1)CSCCC(=NS(=O)(=O)N)N)N
Isomeric SMILES NC(=Nc1scc(n1)CSCC/C(=N/S(=O)(=O)N)/N)N
InChI InChI=1S/C8H15N7O2S3/c9-6(15-20(12,16)17)1-2-18-3-5-4-19-8(13-5)14-7(10)11/h4H,1-3H2,(H2,9,15)(H2,12,16,17)(H4,10,11,13,14)
InChI Key XUFQPHANEAPEMJ-UHFFFAOYSA-N

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
No information available.
Summary of Clinical Use Click here for help
Famotidine is used to treat stomach and duodenal ulcers, gastroesophageal reflux, and conditions of over-production of stomach acid.
Mechanism Of Action and Pharmacodynamic Effects Click here for help
Famotidine is a histamine H2 antagonist. Activation of this receptor mediates gastric acid secretion, so antagonism inhibits gastric acid secretion.
External links Click here for help
For extended ADME data see the following:

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