science

Metopon

Metopon is a science 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 Metopon rather than just read about it. In short: Metopon (5-methylhydromorphone, CAS number 124-92-5) is an opioid analogue that is a methylated derivative of hydromorphone which was invented in 1929 as an analgesic. Metopon is sometimes used in medicine.

Key takeaways

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

Reference excerpt

Metopon (5-methylhydromorphone, CAS number 124-92-5) is an opioid analogue that is a methylated derivative of hydromorphone which was invented in 1929 as an analgesic. Metopon is sometimes used in medicine. Although longer acting than hydromorphone, metopon is less potent and its oral bioavailability is fairly low. Generally, metopon has few advantages to distinguish it from other, more commonly used opioid analgesics, although it does have a slightly lower tendency to produce nausea and respiratory depression compared to morphine. In Canada, as of 1948, the hydrochloride of metopon (free base conversion ratio 0.891, molecular weight 335.8) was available only for oral administration for malignant pain and for maintenance of those habituated to morphine; the only dosage form available was singly scored 8 mg tablets. It was manufactured by Parke, Davis, & Co., and was only for sale to doctors and hospitals. Parke, Davis & Co. did not sell metopon to pharmacies. It is unknown whether metopon tablets are still manufactured and sold in Canada. Metopon tablets, ampoules, and suppositories are available in Switzerland, Austria, Germany, and other countries in Continental Europe and the drug is used in Patient Controlled Analgesia pumps for severe chronic pain in particular. Metopon is listed under Schedule II of the US Controlled Substances Act 1970, meaning it has an accepted medical use, but at this time it is not produced commercially and is seen only in laboratory research. It did see some use in medicine — oncology in particular — in the US in the 1950s. Currently metopon, which has a DEA ACSCN of 9260, does not have an annual manufacturing quota listed in the Federal Register and the bulk of the research on the drug at this time is taking place in Germany, Switzerland, and Austria.

Synthesis

See also 14-Methoxymetopon 14-Ethoxymetopon 14-Phenylpropoxymetopon N-Phenethyl-14-ethoxymetopon

References

Illustrations

Worked examples

Example 1 — a first encounter with Metopon

Start with the simplest possible case. Write down what Metopon claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Metopon 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 Metopon 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 Metopon

In research: Metopon appears in science 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 Metopon 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: Metopon is common in secondary-school and first-year university syllabi. It links to neighbouring topics 4,5-Epoxymorphinans, Drugs developed by Parke-Davis, Drugs not assigned an ATC code, so understanding it makes those chapters shorter.
In everyday life: Look for Metopon 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 Metopon in 20 minutes

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

Frequently asked questions

What is Metopon in simple terms?

Why does Metopon matter?

Because it connects several science 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 Metopon?

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 Metopon.