SHEET /m/levonorgestrel · PubChem CID 13109 · CAS 797-63-7 · REV 2026.07
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Levonorgestrel
from sourceC21H28O2 · 312.4 g/mol
Jadelle · Postinor · Levonelle · Microval
What is Levonorgestrel?
A progestin in many birth control pills, the Mirena coil and the morning-after pill sold as Plan B. As an emergency pill it works mainly by delaying ovulation. from source
CategoryPrescription medicine
Fig. 1 · 2D structure RDKit
SMILES
CC[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@]2(C#C)O)CCC4=CC(=O)CC[C@H]34Where you'll find it
Dispensed on prescription, not sold on a shelf. See the rest of the prescription medicine group.
Relative acute toxicity from source
Animal study data · LD50
- Reported LD50
- 5,010 mg/kg · very low toxicity
- Species
- rat
- Route
- oral
An LD50 describes acute toxicity under experimental conditions and is not a safe or dangerous dose for a person.
Toxicity & hazards
Toxicity · LD50
5,010 mg/kg · very low toxicity · LD50 rat oral from source
3 more reported values
- 5,010 mg/kgLD50 · oral · mouse
- 7,300 mg/kgLD50 · other · mouse
- 11,200 mg/kgLD50 · other · rat
DangerIrritantHealth hazardEnvironmentalH302, H312, H315, H319, H332, H351, H360, H362, H400, H410from source
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