Sodium oxybate

Sodium oxybate, sold under the brand name Xyrem among others, is a medication used to treat two symptoms of narcolepsy: sudden muscle weakness and excessive daytime sleepiness.[2][3] It is used sometimes in France and Italy as an anesthetic given intravenously;[4]:15, 27–28 it is also used in Italy to treat alcohol addiction and alcohol withdrawal syndrome.[5]

Sodium oxybate
Clinical data
Trade namesXyrem, Alcover, Somsanit, others[1]
Other namesNSC-84223, WY-3478
AHFS/Drugs.comMonograph
MedlinePlusa605032
License data
Routes of
administration		By mouth
ATC code
Legal status
Legal status
  • AU: S8 (Controlled drug)
  • CA: CDSA Schedule III/FDA Schedule G Part I
  • UK: CD POM (Schedule 2)
  • US: Schedule I but Schedule III when in an FDA-approved drug product
  • EU: Rx-only
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Bioavailability88%[2]
Protein binding<1%[2]
Elimination half-life0.5 to 1 hour.
ExcretionAlmost entirely by biotransformation to carbon dioxide, which is then eliminated by expiration
Identifiers
CAS Number
PubChem CID
PubChem SID
ChemSpider
UNII
KEGG
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.007.231
Chemical and physical data
FormulaC4H7NaO3
Molar mass126.087 g·mol−1
3D model (JSmol)
 NY (what is this?)  (verify)

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, while sodium oxybate, when used under an FDA NDA or IND, was classified as a Schedule III controlled substance for medicinal use under the Controlled Substances Act, with illicit use subject to Schedule I penalties.[6]

Sodium oxybate was approved for use by the FDA to treat symptoms of narcolepsy in 2002,[2] 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 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.[2] In Canada and the European Union (EU) it was classified as a Schedule III and a Schedule IV controlled substance, respectively.[7]

It was approved for treating symptoms of narcolepsy in the European Union in 2005.[3]

Orphan Medical had developed it and was acquired by Jazz Pharmaceuticals in 2005. The drug is marketed in Europe by UCB. Jazz raised the price of the drug dramatically after it acquired Orphan,[8] and paid a $20M fine for off-label marketing of the drug in 2007.[9]

Medical use

Clinical use of sodium oxybate was introduced in Europe in 1964, as 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.[4]:15,27–28

The major use of sodium oxybate is in treating two of the symptoms of narcolepsy – cataplexy (sudden muscle weakness) and excessive daytime sleepiness.[2] Reviews of sodium oxybate concluded that it is well tolerated and associated with "significant reductions in cataplexy and daytime sleepiness,"[10] and that its effectiveness "in treating major, clinically relevant narcolepsy symptoms and sleep architecture abnormalities" has been established.[11] However, because of the risks of abuse associated with this medication, it is available in the US only through a risk evaluation and mitigation strategy (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 people to whom it is prescribed must be enrolled in a program for the drug and must document that they are using the drug safely.[2]

In more recent times, investigations of its use in dealing with alcohol withdrawal syndrome have begun. These started in Italy, where its use in treating alcohol addiction was also explored; the evidence for these uses is weak[4]:15,28–29[5] but growing and it has also been approved for use in Austria.[12] There is insufficient evidence to make a definitive comparison with clomethiazole or benzodiazepine-based treatment approaches, though some data 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."[13] 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."[12] 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."[14]

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 breast feeding mothers.[3]

Adverse effects

The US label for sodium oxybate has a black box warning because it is a central nervous system depressant (CNS depressant) and for its potential for abuse. Other potential adverse side effects include respiratory depression, seizures, coma, and death, especially when it is taken in combination with other CNS depressants such as alcohol.[2][15][16] Cases of severe dependence and cravings have been reported with excessive and illicit use of this medication.[2][15][17] GHB, the protonated (acidic) form of this salt, has been used to commit drug-facilitated sexual assault and date rape,[15][16][18][19] though the illicit form of GHB typically has different characteristics from pharmaceutical-grade sodium oxybate.[20]

It causes dizziness, nausea, and headache in 10% to 20% of people who take it; nausea is more common in women than men.[3][21]

Between 1% and 10% of people experience nasal congestion, runny nose, or sore throat, loss of appetite, distorted sense of taste, cataplexy, weakness, nervousness or anxiety, depressed mood, nightmares or abnormal dreams, sleep paralysis, sleepwalking, or other sleep disturbances including insomnia, sleepiness or sedation, falls, vertigo, tremor, balance disorder, cognitive issues including disturbance in attention, confusion or disorientation, numbed sense of touch, tingling, blurred vision, heart palpitations, high blood pressure, shortness of breath, snoring, vomiting, diarrhea, stomach pain, excessive sweating, rashes, joint pain, muscle pain, back pain, muscle spasms, bedwetting, urinary incontinence, and swelling of the limbs.[3]

Overdose

Reports of overdose in medical literature are generally from abuse, and often involve other drugs as well. Symptoms include vomiting, excessive sweating, periods of stopped breathing, seizures, agitation, loss of psychomotor skills, and coma. Overdose can lead to death due to respiratory depression. People who overdose may die from asphyxiation from their own vomit. People that have overdosed or suspected of overdosing may need to be made to vomit, be intubated, or/and put on a ventilator.[2][3]

Interactions

It should not be used with other drugs that are CNS depressants like alcohol or sedatives.[2] Use with divalproex results in about a 25% increase in the availability of sodium oxybate.[2]

Pharmacology
Main article: gamma-Hydroxybutyric acid

The mechanism of action of sodium oxybate is unknown.[2][3] GHB is a normal metabolite of GABA that interacts with the GABAB receptor.[2]

It is rapidly absorbed and is about 88% bioavailable; very little is bound to plasma protein. The average time to peak plasma concentration ranges from 0.5 to 1.25 hours. Very little of the drug is excreted; instead, it is mostly metabolized through several steps into carbon dioxide and water.[2]

Chemistry

Sodium oxybate is the sodium salt of γ-hydroxybutyric acid (GHB). Its systematic chemical name is sodium 4-hydroxybutanoate, though synonyms like sodium γ-hydroxybutyrate are commonly used. Its condensed structural formula is HOCH
2CH
2CH
2CO
2Na (molecular formula: C
4H
7NaO
3) and its molar mass is 126.09 g mol−1. It is highly hydrophilic.[2] Treating the salt with acid allows the carboxylic acid form of the compound, which is GHB, to be recovered.

History

Alexander Zaytsev worked on this chemical family and published work on it in 1874.[22]:79[23] The first extended research into GHB and its use in humans was conducted in the early 1960s by Dr. Henri Laborit to use in studying the neurotransmitter GABA.[4]:11–12[24] It was studied in a range of uses including obstetric surgery and during childbirth and as an anxiolytic; there were anecdotal reports of it having antidepressant and aphrodisiac effects as well.[4]:27 It was also studied as an intraveuous anesthetic agent and was marketed for that purpose starting in 1964 in Europe but it was not widely adopted as it caused seizures; as of 2006 that use was still authorized in France and Italy but not widely used.[4]:27–28 GHB was also studied to treat alcohol addiction[4]:28–29 and for use in narcolepsy from the 1960s onwards.[4]:28

In May 1990 GHB was introduced as a dietary supplement and was marketed to body builders, for help with weight control and as a sleep aid, and as a "replacement" for L-tryptophan, which was removed from the market in November 1989 when batches of it were found to cause eosinophilia-myalgia syndrome. By November of that year 57 cases of illness caused by the GHB supplements had been reported to the Centers for Disease Control and Prevention, with people having taken up to three teaspoons of GHB; there were no deaths but nine people needed care in an intensive care unit.[25][26] The FDA issued a warning in November 1990 that sale of GHB was illegal.[25] GHB continued to be manufactured and sold illegally and it and analogs were adopted as a club drug and came to be used as a date rape drug. The DEA made seizures and the FDA reissued warnings several times throughout the 1990s.[27][28][29]

At the same time, research on the use of GHB in the form of sodium oxybate had formalized, as a company called Orphan Medical Inc. had filed an investigational new drug application and was running clinical trials with the intention of gaining regulatory approval for use to treat narcolepsy.[4]:18–25;28[30]:10 In 1996 Orphan contracted with Lonza Group, a contract manufacturer for supply of the drug.[31]

In 2000 the Hillory J. Farias and Samantha Reid Date-Rape Prevention Act of 2000 was signed into law in the US, which made GHB on Schedule I of the Controlled Substances Act, but sodium oxybate, when used under an IND or NDA from the US FDA, was considered a Schedule III substance but with Schedule I trafficking penalties.[32][33]

It was approved by the FDA in 2002 under the trade name Xyrem with a strict risk control strategy to prevent drug diversion and control the risk of abuse by people to whom it was prescribed.[34]

Orphan Medical licensed the right to market the drug in Europe to Celltech in 2003.[35][36] In 2004 Celltech was acquired by UCB[37] and in 2005 Jazz Pharmaceuticals acquired Orphan Medical.[38]

In January 2007 Valeant announced that Jazz had licensed rights to market Xyrem in Canada to Valeant.[39]

In July 2007 Jazz and their subsidiary Orphan Medical pleaded guilty to a criminal charge of felony misbranding in their marketing of sodium oxybate; they also settled a civil suit at the same time. The matter had been raised by a former sales representative who filed a qui tam case against the company under the False Claims Act. Sales representatives had made sales calls to doctors who did not treat people with narcolepsy and told them about potential uses for the drug including fatigue, insomnia, chronic pain, weight loss, depression, bipolar disorders, and movement disorders like Parkinson’s Disease, and downplayed the risks described in the label's black box warning. A sales manager who had been involved in the illegal marketing scheme had previously pleaded guilty and a psychiatrist who promoted the drug had previously been charged. Jazz paid $20M in total and agreed to a corporate integrity agreement and to implement internal reforms.[9][40][41]

The FDA sent Jazz an FDA warning letter about safety violations in September 2007.[42]

In 2010 the FDA rejected Jazz' New Drug Application for use of sodium oxybate in fibromyalgia.[43]

In October 2011, the FDA sent Jazz another FDA warning letter for failing to collect, evaluate, and promptly report adverse effects to the FDA after it started marketing the drug.[42] It sent another letter in 2013 saying that the problems described in the 2011 letter appeared to be resolved.[44]

In January 2017 the FDA approved the first generic sodium oxybate product for narcolepsy symptoms, which is also subject to the same REMS program conditions as the original.[45] By April 2017 7 companies had filed ANDAs with the FDA to market generic versions of Xyrem and Jazz had filed patent infringement cases against them. Hikma Pharmaceuticals had been the first company to file an ANDA and Jazz settled with them in April 2017; under the agreement Hikma could begin selling an authorized generic in 2023 under Jazz' REMS, and would have five years of exclusivity, however, those conditions could change if Jazz' patents were invalidated.[46][47]

In 2017, Jazz and Valeant terminated the agreement under which Valeant marketed Xyrem in Canada.[48]

Society and culture

Regulation

In the US, GHB is a Schedule I controlled substance, while sodium oxybate, when used under an FDA NDA or IND, was classified as a Schedule III controlled substance for medicinal use under the Controlled Substances Act, with illicit use subject to Schedule I penalties.[6]

In Canada and the European Union (EU), as of 2009 it was classified as a Schedule III and a Schedule IV controlled substance, respectively.[7]

Cost

In the US, the cost (as of Q3 2015) of Xyrem is $5,468.09 per 180 mL bottle (500 mg/mL)(a 10 to 15-day supply) As of 2017 the cost of sodium oxybate in the UK was £540.00 to £1,080.00 for a thirty day supply,[49] which at typical doses is £6,500 to £13,100 per year.[50]

Jazz Pharmaceuticals raised the price of Xyrem 841% earning a total of $569 million in 2013 and representing more than 50% of Jazz Pharmaceutical's revenues.[8] In 2007 it cost $2.04; by 2014 it cost $19.40 per 1-milliliter dose.[8] Jazz offers copay assistance to help patients access the expensive drug.[8] According to DRX, a drug-data report published by Bloomberg, Jazz Pharmaceuticals price increase on Xyrem topped the list of price hikes in 2014.[8]

Historically, orphan drugs cost more than other drugs and have received special treatment since the enactment of the U.S. Orphan Drug Act of 1983. However, these steep price increases of orphan and other specialty drugs has come under scrutiny.[8] The average cost of a specialty drug in the US was $65,000 annually in June 2013 (about $5,416 a month). The price of Xyrem in the US has inflated by an average of 40% annually since it became available as a prescription.[51]

In European Union (EU) countries, the government either provides national health insurance (as in the UK and Italy) or strictly regulates quasi-private social insurance funds (as in Germany, France, and the Netherlands). These government agencies are the sole purchaser (or regulator) of medical goods and services and have the power to set prices.[52] The cost of pharmaceuticals, including sodium oxybate, tends to be lower in these countries.[52]

NHS England authorises and pays for sodium oxybate by means of individual funding requests on the basis of exceptional circumstances. The British Department of Health pays for the medication for 80 patients who are taking legal action over problems linked to the use of the swine flu vaccine Pandemrix at a cost of £12,000 a year. As of 2016 there were many areas in the UK where NHS did not pay for it.[53][54] In May 2016 they were ordered by the High Court to provide funding to treat a teenager with severe narcolepsy. The judge criticised their “thoroughly bad decision” and “absurd” policy discriminating against the girl when hundreds of other NHS patients already receive the drug.[55]

Names

Sodium oxybate is the common name for the chemical; it has no international nonproprietary name (INN).[56]

As of April 2018 sodium oxybarate was sold under the following brands: Alcover (Italy), Gamma-OH (France), Natrii oxybutyras Kalceks (Latvia), Somsanit (Germany), Xyrem (many countries by Jazz and UCB).[1]

Research

Sodium oxybate needs to be given during the night; as of 2017 research was ongoing to create formulations that would last through the night.[57]

Jazz has been developing JZP-386, a deuterated analog of sodium oxybate. The company presented Phase I results in 2015, stating that deuterium-related effects made it necessary to do further formulation work as part of the drug's development.[58]

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