Levonorgestrel Other names: D-norgestrel L-norgestrel

Chemical formula: C₂₁H₂₈O₂  Molecular mass: 312.446 g/mol  PubChem compound: 13109

Active ingredient description

The precise mode of action of levonorgestrel as an emergency contraceptive is not known. At the recommended regimen, levonorgestrel is thought to work mainly by preventing ovulation and fertilisation if intercourse has taken place in the preovulatory phase, when the likelihood of fertilisation is the highest.

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
G03AC03 Levonorgestrel G Genito urinary system and sex hormones → G03 Sex hormones and modulators of the genital system → G03A Hormonal contraceptives for systemic use → G03AC Progestogens
Discover more medicines within G03AC03
G03AD01 Levonorgestrel G Genito urinary system and sex hormones → G03 Sex hormones and modulators of the genital system → G03A Hormonal contraceptives for systemic use → G03AD Emergency contraceptives
Discover more medicines within G03AD01

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  
EMERRES Tablet Medicines & Healthcare Products Regulatory Agency (GB) MPI, EU: SmPC
JAYDESS Intrauterine delivery system 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: 797-63-7
DrugBank Drug: DB00367
KEGG Drug: D00950
PubChem Compound: 13109
RxNorm Ingredient: 6373
SNOMED-CT Concept: 126109000
Levonorgestrel (substance)
UNII Identifier: 5W7SIA7YZW
LEVONORGESTREL

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