O104 Sigma-Aldrich



Synonym: 5-Methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]sulfinyl]-1H-benzimidazole, Antra, Losec

  • CAS Number 73590-58-6

  • Empirical Formula (Hill Notation) C17H19N3O3S

  • Molecular Weight 345.42

  •  MDL number MFCD00083192

  •  PubChem Substance ID 24897870

  •  NACRES NA.77



General description

Omeprazole is a benzimidazole derivative, a weak base and is lipophilic in nature. This compound is pH sensitive and does not exists in its original form at low pH.


Omeprazole has been used as an atypical cytochrome P450 (CYP) 1A2 inducer in Dulbecco′s modified eagle′s medium (serum free) to study the effects of inducers on CYP activities in human hepatocytes and also to compare with other classical aryl hydrocarbon receptor ligands.

Biochem/physiol Actions

Omeprazole binds covalently to proton pump (H+, K+-ATPase) and inhibits gastric secretion. It is useful in ameliorating the effects of peptic oesophagitis, duodenal and gastric ulcer. Omeprazole is preferred over antagonists of histamine H2-receptor and ranitidine for its higher efficiency. It is also useful in treating Zollinger-Ellison syndrome.

Features and Benefits

This compound is a featured product for ADME Tox research. Click here to discover more featured ADME Tox products. Learn more about bioactive small molecules for other areas of research at

This compound was developed by AstraZeneca. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.


Hygroscopic, photosensitive

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


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