Norethisterone

from source

C20H26O2 · 298.4 g/mol

Primolut-N · Micronor · Norethindrone · Anovule

What is Norethisterone?

One of the first progestins, made in 1951, and still in birth control pills and in tablets that delay a period. It is also called norethindrone. from source

CategoryPrescription medicine

Chemical familyAlcohols Ketones

LeaderboardsBiggest Deadliest

Fig. 1 · 2D structure RDKit

SMILESC[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@]2(C#C)O)CCC4=CC(=O)CC[C@H]34

Where 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: 6,000 mg/kg · very low toxicity
Species: mouse
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

6,000 mg/kg · very low toxicity · LD50 mouse oral from source

DangerIrritantHealth hazardH312, H332, H351, H360from source

Keep roaming

Where Norethisterone leads

Sources & methodology

PubChem CID: 6230
Wikidata: Q421352
Structure: PubChem → RDKit
LD50: PubChem
Similar molecules: MoleculeFinder fingerprint similarity
Data refreshed: October 19, 2026

How MoleculeFinder sources and labels its data