Chemical formula: C₁₀H₁₆N₆S  Molecular mass: 252.339 g/mol  PubChem compound: 2756

Active ingredient description

Cimetidine is a histamine H2-receptor antagonist which rapidly inhibits both basal and stimulated gastric secretion of acid and reduces pepsin output. It is a reversible, competitive antagonist, and is used as an anti-ulcer drug.

Medicine classification

This medicinal substance has been classified in the anatomical therapeutic chemical (ATC) classification according to its main therapeutic use as follows:

ATC code Group title Classification
A02BA01 Cimetidine A Alimentary tract and metabolism → A02 Drugs for acid related disorders → A02B DRUGS FOR PEPTIC ULCER AND GASTRO-OESOPHAGEAL REFLUX DISEASE (GORD) → A02BA H2-receptor antagonists
Discover more medicines within A02BA01

Product monographs

Competent medicine agencies globally have authorized commercialization of this active ingredient according to these medication package inserts (MPIs):

Title Information Source Document Type  
CIMETIDINE Film-coated tablet Medicines & Healthcare Products Regulatory Agency (GB) MPI, EU: SmPC

Structural formula

Graphic representation of the active ingredient's molecular structure

3D molecular structure

3D representation of the active ingredient's molecular structure

External identifiers

CAS Substance: 51481-61-9
DrugBank Drug: DB00501
KEGG Drug: D00295
PubChem Compound: 2756
RxNorm Ingredient: 2541
SNOMED-CT Concept: 373541007
Cimetidine (substance)
UNII Identifier: 80061L1WGD


Cimetidine is an active ingredient of these brands:

Austria (AT)

Brazil (BR)

Cyprus (CY)

Ecuador (EC)

Ireland (IE)

Japan (JP)

Mexico (MX)

Singapore (SG)

Tunisia (TN)

Turkey (TR)

United Kingdom (UK)

Note the following: The list of brand names is continuously updated, and thus does not include the total of products circulating worldwide.

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