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Safety and Efficacy of Xyrem Oral Solution (Sodium Oxybate) Compared With Placebo in Narcoleptic Patients

This study has been completed.
Information provided by:
Orphan Medical Identifier:
First received: November 13, 2002
Last updated: June 23, 2005
Last verified: July 2004
The initial portion of the protocol involves discontinuing any medications for cataplexy that the patient may be taking. Subsequently, the patient is prescribed a dose of oral solution of study drug or placebo over a 10-11 week period. During the trial, narcolepsy symptoms will be evaluated. Participants are allowed to continue using stimulant medications at constant doses during the study. A total of 1 to 3 daytime visits in addition to 4 overnight visits to the sleep center will be required to complete the study.

Condition Intervention Phase
Narcolepsy Drug: sodium oxybate Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double
Primary Purpose: Treatment
Official Title: Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Multi-Center Trial Comparing the Effects of Orally Administered Xyrem (Sodium Oxybate) With Placebo for the Treatment of Narcolepsy

Resource links provided by NLM:

Further study details as provided by Orphan Medical:

Estimated Enrollment: 200
Study Start Date: December 2000
Estimated Study Completion Date: April 2004

Ages Eligible for Study:   16 Years and older   (Child, Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


  • Have signed & dated informed consent before beginning protocol procedures.
  • Willing & able to complete entire trial as described in protocol.
  • 16 years of age or older.
  • Have a history and presenting symptoms of excessive daytime sleepiness.
  • Have a history of cataplexy localizable to a specific muscle group(s) or part(s) of body during which the patient is lucid (not experiencing an inadvertent nap or micro sleep).
  • Have valid PSG & MSLT scores (collected during an overnight test) within last five years and a current diagnosis of narcolepsy according to the following criteria established by the American Sleep Disorders Association: (1) Recurrent daytime naps or lapses into sleep occur almost daily for at least 3 months; (2) Sudden bilateral loss of postural muscle tone occurs in association with intense emotion (cataplexy); (3) Polysomnography demonstrates one or more of the following: (a) Sleep latency less than 10 minutes; (b) REM sleep latency less than 20 minutes; (c) An MSLT that demonstrates a mean sleep latency of less than 5 minutes; (d) Two or more sleep-onset REM periods
  • Females who are surgically sterile, two years post-menopausal, or if of child-bearing potential, using a medically accepted method of birth control and agree to continue use of this method for the duration of the trial.
  • In the opinion of the investigator, have adequate support for the duration of trial to include transportation to and from trial site. In addition, if in the investigator’s assessment it is clinically indicated, the patient is willing to not operate a car or heavy machinery for the duration of the trial or for as long as the investigator deems clinically indicated.


  • Received gamma-hydroxybutyrate in the last 30 days.
  • Have taken any investigational therapy within 30-day period prior to initial screening visit for this trial.
  • Patients taking fluoxetine (Prozac).
  • Have been diagnosed with sleep apnea syndrome, defined as an Apnea Index > 10 per hour or an Apnea Hypopnea Index greater than 15 per hour, or have any other cause of daytime sleepiness, and have any other disorder(s) that can be considered a primary cause of excessive daytime sleepiness.
  • Taking hypnotics, tranquilizers, antihistamines (except for non-sedating antihistamines), benzodiazepines or clonidine at the start of the baseline period. Patients taking anticonvulsants are not eligible to participate even if willing to washout anticonvulsants for the trial.
  • Experiencing unstable cardiovascular, endocrine, neoplastic (excluding localized basal cell carcinoma), gastrointestinal, hematologic, hepatic, immunologic, metabolic, neurological (other than narcolepsy/cataplexy), pulmonary, and/or renal disease which would place the patient at risk during the trial or compromise objectives outlined in the protocol.
  • Have psychiatric disorders, major affective or psychotic disorders, or other problems that, in the investigator’s opinion, would preclude the patient's participation and completion of this trial or compromise reliable representation of subjective symptoms.
  • Have current or recent (within one year) history of a substance use disorder including alcohol abuse as defined by DSM-IV.
  • Serum creatinine greater than 2.0 mg/dL, abnormal liver function tests (SGOT [AST] or SGPT [ALT] more than twice the upper limit of normal), or elevated serum bilirubin (more than 1.5 times upper limit of normal), or pre-trial ECG results demonstrating clinically significant arrhythmias, greater than a first degree AV block or a history of myocardial infarction within last six months.
  • Have an occupation that requires variable shift work or routine night shift.
  • Have a clinically significant history of seizure disorder, a history of clinically significant head trauma (i.e., concussion resulting in clinically significant loss of consciousness) or past invasive intracranial surgery, and are taking anticonvulsant medications.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00049803

  Show 45 Study Locations
Sponsors and Collaborators
Orphan Medical
Study Chair: William Houghton, MD Orphan Medical
Study Director: Harry N Cook, MBA, RPh Orphan Medical
  More Information

Publications automatically indexed to this study by Identifier (NCT Number): Identifier: NCT00049803     History of Changes
Other Study ID Numbers: OMC-SXB-15
Study First Received: November 13, 2002
Last Updated: June 23, 2005

Keywords provided by Orphan Medical:
Sodium Oxybate
Excessive Daytime Sleepiness
Gamma Hydroxybutyric Acid
Orphan Medical
Orphan Drug

Additional relevant MeSH terms:
Disorders of Excessive Somnolence
Sleep Disorders, Intrinsic
Sleep Wake Disorders
Nervous System Diseases
Mental Disorders
Sodium Oxybate
Adjuvants, Anesthesia
Anesthetics, Intravenous
Anesthetics, General
Central Nervous System Depressants
Physiological Effects of Drugs processed this record on August 22, 2017