chemistry

Sodium oxybate

Sodium oxybate 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 Sodium oxybate rather than just read about it. In short: Sodium oxybate, sold under the brand name Xyrem among others, is a medication used to treat symptoms of narcolepsy: sudden muscle weakness and excessive daytime sleepiness. It is used sometimes in France and Italy as an anesthetic given intravenously.

Key takeaways

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

Reference excerpt

Sodium oxybate, sold under the brand name Xyrem among others, is a medication used to treat symptoms of narcolepsy: sudden muscle weakness and excessive daytime sleepiness. It is used sometimes in France and Italy as an anesthetic given intravenously. It is also approved and used in Italy and in Austria to treat alcohol dependence and alcohol withdrawal syndrome. Sodium oxybate is the sodium salt of γ-hydroxybutyric acid (GHB). The clinical trials for narcolepsy were conducted just as abuse of GHB as a club drug and date rape drug became a matter of public concern. In 2000, GHB was made a Schedule I controlled substance in the United States, while sodium oxybate, when used under an FDA New Drug Application or Investigative New Drug application, was classified as a Schedule III controlled substance for medicinal use under the Controlled Substances Act, with illicit use subject to Schedule I penalties. Sodium oxybate was approved for use by the US Food and Drug Administration (FDA) to treat symptoms of narcolepsy in 2002, with a strict risk evaluation and mitigation strategy (REMS) program mandated by the FDA. The US label for sodium oxybate also has a black box warning because it is a central nervous system (CNS) depressant and may cause respiratory depression, seizures, coma, or death, especially if used in combination with other CNS depressants such as alcohol, and its use may cause dependence. In Canada and the European Union it was classified as a Schedule III and a Schedule IV controlled substance, respectively. It was approved for treating symptoms of narcolepsy in the European Union in 2005. Orphan Medical had developed it and was acquired by Jazz Pharmaceuticals in 2005. The drug is marketed in Europe by UCB. Jazz Pharmaceuticals raised the price of the drug dramatically after it acquired Orphan, and paid a $20M fine for off-label marketing of the drug in 2007.

Medical uses Clinical use of sodium oxybate was introduced in Europe in 1964 as an anesthetic given intravenously, but it was not widely used since it sometimes caused seizures. As of 2006, it was still authorized for this use in France and Italy but not widely used. The major use of sodium oxybate is in treating two of the symptoms of narcolepsy – cataplexy (sudden muscle weakness) and excessive daytime sleepiness. Reviews of sodium oxybate concluded that it is well tolerated and associated with "significant reductions in cataplexy and daytime sleepiness", and that its effectiveness "in treating major, clinically relevant narcolepsy symptoms and sleep architecture abnormalities" has been established. However, because of the risks of abuse associated with this medication, it is available in the US only through a REMS program mandated by the FDA. The program requires that providers who prescribe it are certified to do so, that it is dispensed only from a central pharmacy that is certified to do so, and that people to whom it is prescribed be enrolled in a program for the drug and document that they are using the drug safely. Investigations of its use in dealing with alcohol withdrawal syndrome and in the maintenance of abstinence began in 1989 in Italy, where it was then approved in these indications in 1991. It has also been approved for use in Austria. Over the years, several studies were conducted to further substantiate sodium oxybate efficacy in these indications. Results of small studies suggest it may be "better than naltrexone and disulfiram regarding abstinence maintenance and prevention of craving in the medium term, i.e. 3–12 months". In a 2014 review, Gillian Keating described sodium oxybate as a "useful option for the treatment of alcohol withdrawal syndrome and for the maintenance of abstinence in alcohol dependence". However, a 2018 review recognised the evidence for its efficacy but noted safety concerns and concluded that "studies are still limited and investigations including a larger number of patients are needed." In this context, a study published in 2019 analyzed safety data from 40 clinical trials and from a pharmacovigilance database covering around 260,000 alcohol-dependent patients treated with sodium oxybate in Italy and Austria. Results showed that sodium oxybate was well-tolerated, risks were controlled, and no safety concerns were reported. The approved sodium oxybate dose regimen for the treatment of alcohol dependence (i.e., around 3.2 g/day) is lower than the one for the treatment of narcolepsy (4.5–9 g/night). In 2023, a PhD thesis conducted at the University of Amsterdam, presented the results of large clinical trials, including a phase 3 trial, and of meta-analyses that confirmed the efficacy, good tolerance, and safety of sodium oxybate in the maintenance of abstinence, particularly in severe alcohol-dependent patients. A group of international researchers has also considered in 2018 that "sodium oxybate has an excellent risk benefit ratio for this indication" and that it is "a very promising therapeutic option for the most severe alcohol-dependent patients and may provide substantial clinical and public health benefit and costs". Multiple trials have shown sodium oxybate to be effective in treating important symptoms of fibromyalgia, such as pain and poor sleep structure. However, in 2010, the FDA voted unanimously against this indication, with commenters citing its potential for abuse as a street drug. Pregnant women should not take it, and women should not become pregnant while taking it. It is excreted in breast milk and should not be used by mothers who are breast feeding.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Sodium oxybate

Start with the simplest possible case. Write down what Sodium oxybate 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 Sodium oxybate 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 Sodium oxybate 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 Sodium oxybate

In research: Sodium oxybate 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 Sodium oxybate 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: Sodium oxybate is common in secondary-school and first-year university syllabi. It links to neighbouring topics GABAB receptor agonists, GHB receptor agonists, Histone deacetylase inhibitors, so understanding it makes those chapters shorter.
In everyday life: Look for Sodium oxybate 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 Sodium oxybate in 20 minutes

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

Frequently asked questions

What is Sodium oxybate in simple terms?

Why does Sodium oxybate 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 Sodium oxybate?

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 Sodium oxybate.