Jazz Pharmaceuticals Announces FDA Approval of Xyrem® (sodium oxybate) for the Treatment of Cataplexy or Excessive Daytime Sleepiness in Pediatric Narcolepsy Patients
DUBLIN, Oct. 29, 2018 /PRNewswire/ -- Jazz Pharmaceuticals plc (Nasdaq: JAZZ) today announced that the U.S. Food and Drug Administration (FDA) approved its supplemental new drug application (sNDA) on October 26, 2018, to revise labeling for Xyrem® (sodium oxybate) oral solution, CIII, to include an indication to treat cataplexy or excessive daytime sleepiness (EDS) in patients with narcolepsy ages seven and older.
"Narcolepsy is often misunderstood, misrepresented, misdiagnosed and underdiagnosed, especially in children," said Claire Crisp, executive director of Wake Up Narcolepsy and mother of a child with narcolepsy. "This approval of Xyrem in pediatric patients is a significant step forward for the narcolepsy community as we work to elevate awareness of the condition in children and ensure patients, both pediatric and adult, have meaningful treatment options available."
"Xyrem is the only FDA-approved treatment available for excessive daytime sleepiness and cataplexy in narcolepsy for adult patients," said Jed Black, M.D., senior vice president, Sleep and CNS Medicine at Jazz Pharmaceuticals and adjunct professor, Stanford Center for Sleep Sciences and Medicine. "In a pivotal study we demonstrated both safety and efficacy of Xyrem in pediatric patients with narcolepsy. We are pleased to lead the sleep community in advancing the science and identifying meaningful treatment options for children and adolescents."
The efficacy of Xyrem for the treatment of cataplexy or EDS in pediatric patients with narcolepsy was established in the multisite Phase 2/3 EXPRESS study, which enrolled patients seven to 17 years of age with narcolepsy with cataplexy.
Participants eligible for the study could either have been taking Xyrem or be Xyrem-naïve at study entry. Xyrem-naïve participants underwent open-label titration to reach a tolerable and effective dose. Following a stable dose period, all participants underwent a two week, double-blind, randomized-withdrawal period and were randomly assigned to either remain on Xyrem at their stable dose, or to receive placebo. The primary efficacy endpoint was the change in weekly number of cataplexy attacks, from the stable-dose period (baseline) to the end of the double-blind period. The change in EDS, as assessed by the Epworth Sleepiness Scale for Children and Adolescents (ESS-CHAD), from baseline to the end of the double-blind period was a key secondary outcome measure. Following the randomized-withdrawal period, participants entered an open-label safety period for up to an additional 47 weeks, for a total study duration of up to one year.
Participants who were randomized to placebo (withdrawn from Xyrem (32 [51%] of 63 patients)) had increased weekly cataplexy attacks (median increase of 12·7 attacks per week [Q1, Q3=3·4, 19·8]) when compared with those who continued treatment with Xyrem (median increase of 0·3 attacks per week [Q1, Q3 = –1·0, 2·5]; p<0·0001).
The safety profile of Xyrem in children and adolescents in this study was similar to that reported in adults, and no new safety concerns were identified following the use of Xyrem for up to one year. The open-label portion of the study is still ongoing. As of February 2017 (the time of the data cut), the most common Treatment-Emergent Adverse Events (TEAEs) (>5%) were enuresis, nausea, vomiting, headache, decreased weight, decreased appetite, nasopharyngitis and dizziness. Two serious TEAEs occurred (acute psychosis which was severe and suicidal ideation which was moderate in severity).
For the data cut, safety assessments included measures of anxiety (Multidimensional Anxiety Scale for Children 10-item [MASC-10]), depressive symptoms (Children's Depression Inventory 2nd Edition Self-Report Short Version [CDI 2:SR(S)]) and suicidality (Columbia-Suicide Severity Rating Scale [C-SSRS]), in addition to TEAEs. T-scores on the MASC-10 were within the average range throughout the study in participants who were Xyrem-naïve and on-Xyrem at study entry. T-scores on the CDI 2:SR(S) were within the average range throughout the study in participants who were Xyrem-naïve and on-Xyrem at study entry; a slight downward trend was observed in mean CDI 2:SR(S) T-scores over time.
Results from the Phase 2/3 EXPRESS study were published in The Lancet Child & Adolescent Health in July 2018, and topline data was presented at APSS in June 2017 and 2018.
The Micromedex DRUGDEX® monograph for Xyrem contains a Class IIA recommendation (recommended, in most cases) for use to treat cataplexy in narcolepsy in the pediatric patient population. The Micromedex DRUGDEX® is one of several statutorily named compendia in the United States Medicaid and Medicare programs for use in the determination of prescription and non-prescription drugs.
IMPORTANT SAFETY INFORMATION
WARNING: Taking XYREM with other CNS depressants such as medicines used to make you or your child fall asleep, including opioid analgesics, benzodiazepines, sedating antidepressants, antipsychotics, sedating anti-epileptic medicines, general anesthetics, muscle relaxants, alcohol, or street drugs, may cause serious medical problems, including trouble breathing (respiratory depression), low blood pressure (hypotension), changes in alertness (drowsiness), dizziness (syncope), and death.
XYREM is a form of gamma hydroxybutyrate (GHB). Abuse or misuse of illegal GHB alone or with other drugs that cause changes in alertness (or consciousness) has caused serious side effects. These effects include seizures, trouble breathing (respiratory depression), changes in alertness (drowsiness), coma, and death.
Because of these risks, you have to go through the XYREM REMS Program to have your or your child's prescription for XYREM filled.
Do not take XYREM if you take or your child takes other sleep medicines or sedatives (medicines that cause sleepiness), drink alcohol, or have a rare problem called succinic semialdehyde dehydrogenase deficiency.
Keep XYREM in a safe place to prevent abuse and misuse. Selling or giving away XYREM may harm others, and is against the law. Tell your doctor if you have ever abused or been dependent on alcohol, prescription medicines, or street drugs.
Anyone who takes XYREM should not do anything that requires them to be fully awake or is dangerous, including driving a car, using heavy machinery, or flying an airplane, for at least 6 hours after taking XYREM. Those activities should not be done until you know how XYREM affects you or your child.
XYREM can cause serious side effects, including the following:
Tell your doctor if you are or your child is on a salt-restricted diet or if you have or your child has high blood pressure, heart failure, or kidney problems. XYREM contains a lot of sodium (salt) and may not be right for you or your child.
The most common side effects of XYREM include nausea, sleepiness, dizziness, vomiting, bedwetting, and tremor (in adults). In pediatric patients, headache, decreased appetite, and weight decrease were also common. Your side effects may increase when you take higher doses of XYREM. XYREM can cause physical dependence and craving for the medicine when it is not taken as directed. These are not all the possible side effects of XYREM.
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.
Please find full prescribing information here: http://pp.jazzpharma.com/pi/xyrem.en.USPI.pdf
About Jazz Pharmaceuticals plc
1. Narcolepsy Fact Sheet. National Institute of Neurological Disorders and Stroke website. http://www.ninds.nih.gov/disorders/narcolepsy/detail_narcolepsy.htm. Updated July 7, 2016. Accessed October 18, 2018.
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SOURCE Jazz Pharmaceuticals plc
Company Codes: NASDAQ-NMS:JAZZ