chemistry

Norgestrienone

Norgestrienone is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Norgestrienone rather than just read about it. In short: Norgestrienone, sold under the brand names Ogyline, Planor, and Miniplanor, is a progestin medication which has been used in birth control pills, sometimes in combination with ethinylestradiol. It was developed by Roussel Uclaf and has been registered for use only in France.

Key takeaways

Norgestrienone belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Norgestrienone to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Norgestrienone from memory before moving on to harder problems.

Reference excerpt

Norgestrienone, sold under the brand names Ogyline, Planor, and Miniplanor, is a progestin medication which has been used in birth control pills, sometimes in combination with ethinylestradiol. It was developed by Roussel Uclaf and has been registered for use only in France. Under the brand name Planor, it has been marketed in France as 2 mg norgestrienone and 50 μg ethinylestradiol tablets. It is taken by mouth. Norgestrienone is a progestin, or a synthetic progestogen, and hence is an agonist of the progesterone receptor, the biological target of progestogens like progesterone. It has some androgenic activity. Norgestrienone was first described in the literature in 1965. It is sometimes referred to as a "second-generation" progestin. Norgestrienone is no longer available.

Medical uses Norgestrienone was used in hormonal contraception to prevent pregnancy. It has typically been used as an oral contraceptive at a dosage of 2 mg/day in combination with ethinylestradiol and 350 μ/day when used alone.

Side effects

Pharmacology

Pharmacodynamics Norgestrienone has been found to possess similar affinity for the progesterone receptor and androgen receptor, and in accordance, has some androgenic activity. The androgenic activity of norgestrienone is greater than that of other 19-nortestosterone derivatives due to the presence of the C9(11) double bond, which enhances said activity. The ratio of progestogenic to androgenic activity appears to be much lower for norgestrienone that it is for other 19-nortestosterone progestins such as norethisterone and levonorgestrel. Gestrinone, the 18-methyl analogue of norgestrienone, has even greater androgenic activity than norgestrienone, as this modification increases androgenic activity similarly.

Pharmacokinetics The metabolism of norgestrienone in humans has been studied.

Chemistry

Norgestrienone, also known as 17α-ethynyl-19-nor-δ9,11-testosterone or as 17α-ethynylestra-4,9,11-trien-17β-ol-3-one, as well as δ9,11-norethisterone or 17α-ethynyltrienolone (17α-ethynyltrenbolone), is a synthetic estrane steroid and a derivative of testosterone and 19-nortestosterone. It is structurally related to the anabolic steroid trenbolone (19-nor-δ9,11-testosterone; the non-17α-ethynylated analogue of norgestrienone), the progestogenic and androgenic steroid gestrinone (the 13β-ethyl variant or 18-methyl derivative of norgestrienone), and the anabolic steroid tetrahydrogestrinone (the 18-methyl and 17α-ethyl variant of norgestrienone).

History Norgestrienone was first described in the literature in 1965. It is sometimes referred to as a "second-generation" progestin based on its time of introduction.

Society and culture

Generic names Norgestrienone is the generic name of the drug and its INNTooltip International Nonproprietary Name. It is also known by its developmental code names RU-2010 and A-301.

Brand names Norgestrienone has been marketed under the brand names Ogyline, Planor, and Miniplanor.

Availability Norgestrienone is no longer marketed and hence is no longer available in any country. It was previously used in France. The medication was never marketed in the United States.

Research Norgestrienone has been studied for use in male hormonal contraception.

References

Illustrations

Worked examples

Example 1 — a first encounter with Norgestrienone

Start with the simplest possible case. Write down what Norgestrienone claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Norgestrienone before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Norgestrienone ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Norgestrienone

In research: Norgestrienone appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Norgestrienone in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Norgestrienone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Androgens, Estranes, Ethynyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Norgestrienone outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Norgestrienone in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Norgestrienone means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Norgestrienone out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Norgestrienone in simple terms?

Why does Norgestrienone matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Norgestrienone?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Norgestrienone.