chemistry

Levomethadone

Levomethadone 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 Levomethadone rather than just read about it. In short: Levomethadone, sold under the brand name L-Polamidon among others, is a synthetic opioid analgesic and antitussive which is marketed in Europe and is used for pain management and in opioid maintenance therapy. In addition to being used as a pharmaceutical drug itself, levomethadone is also the main therapeutic component of methadone, which is a racemic mixture of levomethadone (R-methadone) and dextromethadone (S-me…

Key takeaways

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

Reference excerpt

Levomethadone, sold under the brand name L-Polamidon among others, is a synthetic opioid analgesic and antitussive which is marketed in Europe and is used for pain management and in opioid maintenance therapy. In addition to being used as a pharmaceutical drug itself, levomethadone is also the main therapeutic component of methadone, which is a racemic mixture of levomethadone (R-methadone) and dextromethadone (S-methadone). Levomethadone is used for narcotic maintenance in place of, or in some cases alongside as an alternative, to racemic methadone, owing to concern that the cardiotoxic and QT-prolonging action of racemic methadone might be primarily caused by dextromethadone.

Pharmacology

Pharmacodynamics Levomethadone has approximately 50x the potency of the S-(+)-enantiomer as well as greater μ-opioid receptor selectivity. Accordingly, it is about twice as potent as methadone by weight and its effects are virtually identical in comparison. In addition to its activity at the opioid receptors, levomethadone has been found to act as a weak competitive antagonist of the N-methyl-D-aspartate (NMDA) receptor complex and as a potent noncompetitive antagonist of the α3β4 nicotinic acetylcholine (nACh) receptor.

Chemistry The separation of the stereoisomers is one of the easier in organic chemistry and is described in the original patent. It involves "treatment of racemic methadone base with d-(+)-tartaric acid in an acetone/water mixture [which] precipitates almost solely the dextro-methadone levo-tartrate, and the more potent Levomethadone can easily be retrieved from the mother liquor in a high state of optical purity." There is now an asymmetric synthesis available to prepare both levomethadone (R-(−)-methadone) and dextromethadone (S-(+)-methadone).

Society and culture

Generic names Levomethadone is the generic name of the drug and its INNTooltip International Nonproprietary Name.

Brand names Levomethadone has been sold under brand names including L-Polaflux, L-Polamidon, L-Polamivet, Levadone, Levo-Methasan, Levothyl, Mevodict, Levopidon and Vistadict, among others.

Legal status Levomethadone is listed under the Single Convention On Narcotic Drugs 1961 and is a Schedule II Narcotic controlled substance in the US as an isomer of methadone (ACSCN 9250) and is not listed separately, nor is dextromethadone. It is similarly controlled under the German Betäubungsmittelgesetz and similar laws in practically every other country.

References

Illustrations

Worked examples

Example 1 — a first encounter with Levomethadone

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

In research: Levomethadone 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 Levomethadone 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: Levomethadone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Analgesics, Antitussives, Dimethylamino compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Levomethadone 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Levomethadone” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Levomethadone in 20 minutes

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

Frequently asked questions

What is Levomethadone in simple terms?

Why does Levomethadone 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 Levomethadone?

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 Levomethadone.