chemistry

Naxagolide

Naxagolide 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 Naxagolide rather than just read about it. In short: Naxagolide (INNTooltip International Nonproprietary Name), also known as PHNO, dopazinol, L-647339, and MK-458 among other synonyms, is a dopamine receptor agonist which was developed for the treatment of Parkinson's disease but was never marketed. A radiolabeled form has been used for brain imaging.

Key takeaways

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

Reference excerpt

Naxagolide (INNTooltip International Nonproprietary Name), also known as PHNO, dopazinol, L-647339, and MK-458 among other synonyms, is a dopamine receptor agonist which was developed for the treatment of Parkinson's disease but was never marketed. A radiolabeled form has been used for brain imaging. The drug was developed for use both orally and transdermally. It acts as a potent dopamine D2 and D3 receptor agonist. Naxagolide was described in the 1990s as the most potent dopamine D2 receptor agonist that had been used. It shows about 50-fold selectivity for the dopamine D3 receptor over the dopamine D2 receptor (Ki = 0.16 nM vs. 8.5 nM). The drug is a naphthoxazine derivative. It is structurally similar to ergolines such as pergolide and cabergoline but is a non-ergoline itself. Naxagolide was first described in 1984 and was under development by Merck & Co in the 1980s and 1990s. It was developed for treatment of Parkinson's disease and reached phase 2 clinical trials for this indication. The drug was discontinued due to inadequate effectiveness and/or due to toxicity.

See also List of investigational Parkinson's disease drugs S32504 Adrogolide Quinagolide

References

Illustrations

Worked examples

Example 1 — a first encounter with Naxagolide

Start with the simplest possible case. Write down what Naxagolide 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 Naxagolide 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 Naxagolide 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 Naxagolide

In research: Naxagolide 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 Naxagolide 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: Naxagolide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abandoned drugs, Amines, D2 receptor agonists, so understanding it makes those chapters shorter.
In everyday life: Look for Naxagolide 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 Naxagolide in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Naxagolide 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 Naxagolide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Naxagolide in simple terms?

Why does Naxagolide 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 Naxagolide?

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 Naxagolide.